# Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007

J.-L. Prieur, M. Scardia, L. Pansecchi, R. W. Argyle, M. Sala

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J.-L. Prieur, M. Scardia, L. Pansecchi, R. W. Argyle, M. Sala. Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007. Monthly Notices of the Royal Astronomical Society, 2009, 395 (2), pp.907-917. 10.1111/j.1365-2966.2009.14576.x. hal-00392639

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# Speckle observations with PISCO in Merate – VII. Astrometric measurements of visual binaries in 2007

J.-L. Prieur,<fnref n="1" />★ M. Scardia,<fnref n="2" /> L. Pansecchi,<fnref n="2" /> R. W. Argyle<fnref n="3" /> and M. Sala<fnref n="2" />

Accepted 2009 January 29. Received 2009 January 27; in original form 2008 November 27

## ABSTRACT

We present relative astrometric measurements of visual binaries made during the first semester of 2007, with the Pupil Interferometry Speckle camera and COronagraph (PISCO) at the 102-cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. We obtained 226 new measurements of 214 objects, with angular separations in the range 0.15–4.5 arcsec, and an average accuracy of 0.013 arcsec. The mean error on the position angles is 0.7. Most of the position angles could be determined without the usual 180° ambiguity with the application of triple-correlation techniques and/or by inspection of the long integration files. We also present the new orbits we have computed for ADS 7871, 7982 and 8128, for which our measurements lead to large residuals and/or for which the revision is justified by the significant number of observations made since the publication of the previous orbit.

**Key words:** techniques: interferometric – astrometry – binaries: visual – stars: individual: ADS 7871, ADS 7982, ADS 8128.

## 1 INTRODUCTION

This paper deals with the results of speckle observations of visual binary stars made in Merate (Italy) during the first semester of 2007 with the Pupil Interferometry Speckle camera and COronagraph (PISCO) on the 102-cm Zeiss telescope of INAF – Osservatorio Astronomico di Brera (OAB; Brera Astronomical Observatory). It is the seventh of a series (Scardia et al. 2005, 2006, 2007a, 2008d; Prieur et al. 2008; Scardia et al. 2009, hereafter Papers I to VI), whose purpose is to contribute to the determination of binary orbits. PISCO was developed at Observatoire Midi-Pyrénées (France) and first used at Pic du Midi from 1993 to 1998. It was moved to Merate in 2004 and used there since.

We briefly describe our observations in Section 2. Then, we present and discuss the astrometric measurements in Section 3. Finally, in Section 4, we propose new revised orbits for ADS 7871, 7982 and 8128, partly derived from those observations and derive estimate values for the component masses.

## 2 OBSERVATIONS

The observations were carried out with the PISCO speckle camera with the ICCD (Intensified Charged Coupled Device) detector belonging to Nice University (France). This instrumentation is presented in Prieur et al. (1998) and our observing procedure is described

in detail in Paper VI. For the present observations, thanks to an improvement of our software and a faster computer, we were also able to compute in real time the restricted triple correlation (Aristidi et al. 1997), used for resolving the 180° ambiguity (see Section 3.1).

The description of our sample can be found in our previous papers (e.g. Paper VI). It basically includes all the visual binaries for which new measurements are needed to improve their orbits, that are accessible with our instrumentation.

The distribution of the angular separations measured in this paper is displayed in Fig. 1 and shows a maximum for $\rho \approx 0.7$ arcsec. The closest separation that can be measured with PISCO in Merate is of the order of the diffraction limit, which is $\lambda/D \approx 0.13$ arcsec with the R filter (i.e. $\lambda = 650$ nm) and the Zeiss telescope whose aperture is $D = 1.02$ m. However, it can be smaller in some favourable cases, and in 2005 we managed to measure a separation down to 0.066 arcsec for WRH 28 (Paper IV).

## 3 ASTROMETRIC MEASUREMENTS

The astrometric measurements of the observations made during the first semester of 2007 are displayed in Table 1. The format of the first 10 columns of this table is the same as for the previous papers of this series. It is described, for instance, in Paper VI. In column 11, we report some information about the secondary peaks of the autocorrelation files: diffuse, noisy, elongated or unresolved. The last

<footnote n="1">¹Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse - CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France</footnote>

<footnote n="2">²INAF – Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy</footnote>

<footnote n="3">³Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA</footnote>

<footnote>*E-mail: prieur@ast.obs-mip.fr</footnote>
<figure><img src="image_2.png" /><figcaption>**Figure 1.** Histogram of the angular separations of the 226 measurements reported in this paper.</figcaption></figure>

three columns are dealing with the residuals and will be presented in Section 3.4.

The characteristics of the PISCO *R* and *V* filters can be found in Table 1 of Paper III. Twenty-two objects were observed without any filter because they were too faint. This is indicated with *W* (for ‘white’ light) in the filter column (column 5). In this case, the corresponding bandpass is that of the ICCD detector, with a central wavelength of about 650 nm, close to that of the *R* filter.

The average values of the errors of the 226 measurements reported in this table are 0.013 ± 0.009 arcsec and 0.67 ± 0.47 for ρ and θ, respectively. Our error determination procedure is described in detail in Paper III.

## 3.1 Quadrant determination

As our measurements were obtained from the symmetric auto-correlation files, the θ values first presented a 180° ambiguity. To try resolving this ambiguity and determine the quadrant containing the companion, we have used the method of Aristidi et al. (1997) by computing and analysing restricted triple correlation files. For the couples with the largest separations, a straightforward determination could be done when the companions were visible in the long integration files.

As a result, in Table 1, we are able to give the non-ambiguous (or ‘absolute’) angular separation of 146 out of 226 measurements, i.e. 65 per cent of the total. They are marked with an asterisk in column 9. Otherwise, our angular measurements were reduced to the quadrant reported in the ‘Fourth Catalogue of Interferometric Measurements of Binary Stars’ (Hartkopf et al. 2008b, hereafter IC4).

Our ‘absolute’ θ values are consistent with the values tabulated in IC4, for all objects except for ADS 4208 and MCA 27. In both cases, the corresponding restricted triple-correlation files indicate that the companions are in the southeast quadrant. This is confirmed by the restored images presented in Fig. 2, that we derived with bispectral techniques from the elementary frames recorded on Super-VHS.

ADS 4208: although in disagreement with the last measures reported in IC4, our quadrant determination in 2007.197 is consistent with our previous determinations made in 2005.215 (Paper III), 2006.198 (Paper V) and with the space-based Tycho measurement

(Høg et al. 2000). Two reasons can explain this discrepancy: (i) the two components of ADS 4208 have a small difference in magnitude: $\Delta m_V = 0.01$, which explains the difficulty of determining the quadrant, and (ii) the observations in this paper were made in the *R* band whilst those in IC4 were made in *V*. It is not excluded that the brightest component in *R* may be the faintest in *V*.

MCA 27: our quadrant determination is not in agreement with the latest measurement reported in IC4, but it is consistent with 34 out of 50 measurements, spanning 28 yr (from 1976 to 2004), published in this catalogue.

## 3.2 Unresolved objects

In Table 1, there are three unresolved objects: ADS 6185, ADS 7107 and FIN 349. This was also reported in Paper I for the observations of ADS 6185 and 7107 made in 2004, and in Paper III for the observations of ADS 6185 and FIN 349 made in 2005.

ADS 6185 and FIN 349 have a known orbit, with ephemerides for ρ equal to 0.05 and 0.14, respectively (see Table 1). Those values are close to or below the diffraction limit of the Zeiss telescope in *R* (i.e. $\lambda/D \sim 0.13$ arcsec), which can account for this non-detection.

Let us add that the observations of ADS 6185 in 2004 and 2005 were first found as unsuccessful (Papers I and III), but an improvement of the data processing led to a positive detection of the companion for both observations (Paper IV). Indeed, the model subtraction technique used in Paper IV led to measurements of ρ = 0.110 arcsec in 2004 and ρ = 0.085 arcsec in 2005, in fair agreement with the ephemerides computed with Hartkopf, McAlister & Franz (1989)'s orbit, of ρ = 0.084 and 0.074 arcsec, respectively. Unfortunately, this technique failed for the observations of ADS 6185, ADS 7107 and FIN 349 made in 2007.

As reported in Table 1, we could not measure the position of the companion of ADS 3812 and COU 773 (of 2007.288) because the two auto-correlation peaks, although present, were too diffuse. We could only repeat the observation for COU 773 two days later, and obtained much smaller peaks which led to an error as small as $\Delta\rho = 0.003$ arcsec.

## 3.3 New components?

In April 2005, our observations of ADS 7871 indicated the presence of a third (new) very faint component with a separation of 2.1 arcsec (Paper III). Unfortunately, the present observations had a worse signal-to-noise ratio than the previous ones, and we are unable to confirm this detection.

New possible components were found in the auto-correlations and measured for ADS 3082 (ρ = 2.216 arcsec, θ = 97.5), ADS 6946 (ρ = 3.998 arcsec, θ = 77.9) and ADS 7300 (ρ = 0.443 arcsec, θ = 11.5). However, we have not included those measurements in Table 1, since they may be artefacts. We will try to re-observe those objects in the future to determine whether those components are real or not.

## 3.4 Comparison with published ephemerides

The (*O* − *C*) (Observed minus Computed) residuals of the measurements for the 97 systems with a known orbit in Table 1 are displayed in columns 13 and 14 for the separation ρ and position angle θ, respectively. The orbital elements used for computing the ephemerides were retrieved from the ‘Sixth Catalogue of Orbits of Visual Binary Stars’ (Hartkopf & Mason 2008, hereafter OC6) and from our publications (Papers I and III, Scardia et al. 2008b,c). For
<table><caption>**Table 1.** Measurements of binaries with PISCO and residuals with published orbits.</caption><thead><tr><th>WDS</th><th>Name</th><th>ADS</th><th>Epoch</th><th>Fil.</th><th>Eyep.</th><th>ρ</th><th>σρ</th><th>θ</th><th>σθ</th><th>Notes</th><th>Orbit</th><th>Δρ(O-C)</th><th>Δθ(O-C)</th></tr><tr><th></th><th></th><th></th><th></th><th></th><th>(mm)</th><th>(arcsec)</th><th>(arcsec)</th><th>(°)</th><th>(°)</th><th></th><th></th><th>(arcsec)</th><th>(°)</th></tr></thead><tbody><tr><td>00134+2659</td><td>STT 2AB</td><td>161</td><td>2007.036</td><td>R</td><td>10</td><td>0.400</td><td>0.004</td><td>161.9*</td><td>0.5</td><td>Hartkopf et al. (2008a)</td><td>0.01</td><td>-0.4</td></tr><tr><td>00568+6022</td><td>BU 1099AB</td><td>784</td><td>2007.090</td><td>R</td><td>10</td><td>0.263</td><td>0.003</td><td>2.0*</td><td>1.0</td><td>Cole et al. (1992)</td><td>-0.02</td><td>0.7</td></tr><tr><td>00583+2124</td><td>BU 302</td><td>805</td><td>2007.085</td><td>R</td><td>10</td><td>0.323</td><td>0.003</td><td>202.8</td><td>0.7</td><td>Cvetkovic & Novakovic (2006)</td><td>0.05</td><td>-0.4</td></tr><tr><td>01006+4719</td><td>MAD 1</td><td>829</td><td>2007.090</td><td>R</td><td>20</td><td>0.789</td><td>0.008</td><td>2.3*</td><td>0.4</td><td></td><td></td><td></td></tr><tr><td>01036+6104</td><td>BU 396</td><td>868</td><td>2007.085</td><td>R</td><td>20</td><td>1.303</td><td>0.008</td><td>66.8*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>01095+4715</td><td>STT 515AB</td><td>940</td><td>2007.036</td><td>R</td><td>10</td><td>0.505</td><td>0.003</td><td>121.1*</td><td>0.3</td><td>Scardia et al. (2001)</td><td>0.00</td><td>-0.8</td></tr><tr><td>01106+5101</td><td>BU 235Aa</td><td>963</td><td>2007.058</td><td>R</td><td>20</td><td>0.839</td><td>0.019</td><td>135.1*</td><td>0.8</td><td>Seymour et al. (2002)</td><td>-0.06</td><td>1.0</td></tr><tr><td>01132+6142</td><td>BU 258AB</td><td>987</td><td>2007.058</td><td>R</td><td>20</td><td>1.529</td><td>0.008</td><td>262.1*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>01198-0031</td><td>STF 113A-BC</td><td>1081</td><td>2007.082</td><td>R</td><td>20</td><td>1.626</td><td>0.010</td><td>18.8*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>01311+4337</td><td>ES 4</td><td>1192</td><td>2007.082</td><td>R</td><td>20</td><td>2.798</td><td>0.014</td><td>99.0*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>01445+3957</td><td>STF 149</td><td>1368</td><td>2007.096</td><td>R</td><td>20</td><td>1.492</td><td>0.008</td><td>82.8*</td><td>0.4</td><td></td><td></td><td></td></tr><tr><td>01467+3310</td><td>STF 158AB</td><td>1406</td><td>2007.096</td><td>R</td><td>20</td><td>2.165</td><td>0.026</td><td>269.0*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>01532+1526</td><td>BU 260</td><td>1503</td><td>2007.058</td><td>W</td><td>20</td><td>1.110</td><td>0.013</td><td>256.5*</td><td>0.8</td><td>Cvetkovic & Novakovic (2006)</td><td>0.01</td><td>-2.9</td></tr><tr><td>01557+3620</td><td>HU 1033</td><td>1529</td><td>2007.090</td><td>W</td><td>20</td><td>1.216</td><td>0.008</td><td>217.2*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>02020+0246</td><td>STF 202AB</td><td>1615</td><td>2007.036</td><td>R</td><td>20</td><td>1.829</td><td>0.013</td><td>268.4*</td><td>0.4</td><td>Scardia (1983)</td><td>0.04</td><td>1.7</td></tr><tr><td>02020+7054</td><td>BU 513AB</td><td>1598</td><td>2007.091</td><td>R</td><td>10</td><td>0.707</td><td>0.004</td><td>286.8*</td><td>0.7</td><td>Mason et al. (1999)</td><td>-0.04</td><td>0.3</td></tr><tr><td>02039+4220</td><td>STT 38BC</td><td>1630</td><td>2007.082</td><td>R</td><td>10</td><td>0.314</td><td>0.003</td><td>100.7*</td><td>0.5</td><td>Docobo & Ling (2007a)</td><td>-0.01</td><td>-1.1</td></tr><tr><td>02062+2507</td><td>STF 212</td><td>1654</td><td>2007.085</td><td>R</td><td>20</td><td>1.933</td><td>0.010</td><td>162.1*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>02091+5104</td><td>STF 213AB</td><td>1670</td><td>2007.096</td><td>W</td><td>20</td><td>1.864</td><td>0.009</td><td>325.4*</td><td>0.6</td><td>Starikova (1983)</td><td>-0.03</td><td>-4.1</td></tr><tr><td>02174+6121</td><td>STF 234AB</td><td>1737</td><td>2007.085</td><td>R</td><td>20</td><td>0.733</td><td>0.011</td><td>224.5</td><td>1.3</td><td></td><td></td><td></td></tr><tr><td>02270+3117</td><td>HO 216</td><td>1851</td><td>2007.110</td><td>R</td><td>20</td><td>1.337</td><td>0.019</td><td>3.1*</td><td>1.0</td><td></td><td></td><td></td></tr><tr><td>02405+6129</td><td>STF 283AB</td><td>2014</td><td>2007.085</td><td>R</td><td>20</td><td>1.789</td><td>0.012</td><td>208.8*</td><td>0.4</td><td></td><td></td><td></td></tr><tr><td>02407+2637</td><td>STT 43</td><td>2034</td><td>2007.085</td><td>R</td><td>20</td><td>0.710</td><td>0.016</td><td>351.3</td><td>1.2</td><td>Scardia et al. (2001)</td><td>0.03</td><td>3.9</td></tr><tr><td>02422+4242</td><td>STT 44AB</td><td>2052</td><td>2007.129</td><td>R</td><td>20</td><td>1.370</td><td>0.021</td><td>51.1*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.145</td><td>R</td><td>20</td><td>1.397</td><td>0.008</td><td>55.1*</td><td>0.6</td><td></td><td></td><td></td></tr><tr><td>02511+6025</td><td>STF 306AB</td><td>2161</td><td>2007.145</td><td>R</td><td>20</td><td>2.133</td><td>0.029</td><td>91.9*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03051+2755</td><td>STF 342</td><td>2331</td><td>2007.091</td><td>R</td><td>20</td><td>3.199</td><td>0.016</td><td>302.4*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.091</td><td>W</td><td>20</td><td>3.255</td><td>0.016</td><td>302.7*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03058+4342</td><td>BU 1175</td><td>2334</td><td>2007.082</td><td>R</td><td>20</td><td>0.655</td><td>0.009</td><td>273.1</td><td>1.4</td><td></td><td></td><td></td></tr><tr><td>03130+4417</td><td>STT 51</td><td>2397</td><td>2007.082</td><td>R</td><td>20</td><td>0.685</td><td>0.011</td><td>336.9</td><td>0.5</td><td></td><td></td><td></td></tr><tr><td>03158+5057</td><td>HU 544</td><td>2425</td><td>2007.082</td><td>R</td><td>20</td><td>1.559</td><td>0.008</td><td>101.3*</td><td>0.9</td><td></td><td></td><td></td></tr><tr><td>03250+4013</td><td>HU 1058</td><td>2518</td><td>2007.085</td><td>R</td><td>20</td><td>0.829</td><td>0.010</td><td>113.4*</td><td>0.5</td><td></td><td></td><td></td></tr><tr><td>03285+5954</td><td>STF 384AB</td><td>2540</td><td>2007.085</td><td>R</td><td>20</td><td>1.949</td><td>0.010</td><td>271.8*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03287+5026</td><td>STF 388</td><td>2548</td><td>2007.145</td><td>R</td><td>20</td><td>2.764</td><td>0.024</td><td>213.5*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>03294+4931</td><td>BU 1179</td><td>2558</td><td>2007.145</td><td>R</td><td>20</td><td>0.608</td><td>0.018</td><td>145.8*</td><td>0.9</td><td></td><td></td><td></td></tr><tr><td>03312+1947</td><td>STF 403</td><td>2584</td><td>2007.145</td><td>R</td><td>20</td><td>2.293</td><td>0.017</td><td>172.8*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03344+2428</td><td>STF 412AB</td><td>2616</td><td>2007.082</td><td>R</td><td>10</td><td>0.720</td><td>0.004</td><td>354.8</td><td>0.3</td><td>Scardia et al. (2002a)</td><td>0.00</td><td>0.5</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.091</td><td>R</td><td>10</td><td>0.720</td><td>0.004</td><td>355.0</td><td>0.3</td><td>"</td><td>0.00</td><td>0.7</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.110</td><td>R</td><td>10</td><td>0.705</td><td>0.004</td><td>353.9</td><td>0.6</td><td>"</td><td>-0.01</td><td>-0.4</td></tr><tr><td>03362+4220</td><td>A 1535</td><td>2630</td><td>2007.082</td><td>W</td><td>20</td><td>0.716</td><td>0.008</td><td>339.3*</td><td>0.9</td><td>Hartkopf et al. (2008a)</td><td>-0.01</td><td>1.5</td></tr><tr><td>03466+2728</td><td>COU 694</td><td>–</td><td>2007.091</td><td>W</td><td>20</td><td>2.485</td><td>0.012</td><td>134.5*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03490+1459</td><td>HO 324</td><td>2787</td><td>2007.096</td><td>R</td><td>20</td><td>1.119</td><td>0.011</td><td>329.6</td><td>0.4</td><td></td><td></td><td></td></tr><tr><td>03503+2241</td><td>STF 457AB</td><td>2801</td><td>2007.156</td><td>W</td><td>20</td><td>0.830</td><td>0.012</td><td>89.6*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>03565+3311</td><td>BU 263</td><td>2873</td><td>2007.156</td><td>W</td><td>20</td><td>0.686</td><td>0.017</td><td>105.1*</td><td>0.6</td><td></td><td></td><td></td></tr><tr><td>04059+1058</td><td>STF 491</td><td>2981</td><td>2007.096</td><td>W</td><td>20</td><td>2.849</td><td>0.023</td><td>96.7*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>04091+2839</td><td>HO 326</td><td>3021</td><td>2007.096</td><td>R</td><td>20</td><td>0.333</td><td>0.043</td><td>286.4</td><td>2.2</td><td>Noisy</td><td>Hartkopf et al. (2008a)</td><td>-0.07</td><td>-3.5</td></tr><tr><td>04123+0939</td><td>STT 74</td><td>3053</td><td>2007.096</td><td>R</td><td>20</td><td>0.232</td><td>0.008</td><td>110.8</td><td>1.5</td><td>Noisy</td><td>Alzner (2003)</td><td>-0.00</td><td>2.7</td></tr><tr><td>04140+4235</td><td>A 1711</td><td>3062</td><td>2007.156</td><td>R</td><td>20</td><td>0.680</td><td>0.018</td><td>78.1</td><td>1.0</td><td></td><td></td><td></td></tr><tr><td>04159+3142</td><td>STT 77AB</td><td>3082</td><td>2007.091</td><td>R</td><td>20</td><td>0.554</td><td>0.010</td><td>291.3</td><td>0.7</td><td>Diffuse</td><td>Starikova (1985)</td><td>-0.03</td><td>-0.6</td></tr><tr><td>04179+5847</td><td>STF 511</td><td>3098</td><td>2007.159</td><td>R</td><td>20</td><td>0.498</td><td>0.010</td><td>81.5</td><td>1.9</td><td></td><td>Heintz (1996b)</td><td>-0.00</td><td>-0.4</td></tr><tr><td>04218+5002</td><td>STF 521</td><td>3141</td><td>2007.159</td><td>R</td><td>20</td><td>2.018</td><td>0.010</td><td>256.8*</td><td>0.8</td><td></td><td></td><td></td></tr><tr><td>04224+2049</td><td>BU 87</td><td>3158</td><td>2007.195</td><td>R</td><td>20</td><td>1.909</td><td>0.010</td><td>167.7*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>04227+1503</td><td>STT 82AB</td><td>3169</td><td>2007.195</td><td>R</td><td>20</td><td>1.263</td><td>0.008</td><td>336.8*</td><td>0.3</td><td></td><td></td><td></td></tr><tr><td>04239+0928</td><td>HU 304</td><td>3182</td><td>2007.200</td><td>R</td><td>10</td><td>0.243</td><td>0.004</td><td>16.0*</td><td>0.5</td><td></td><td></td><td></td></tr><tr><td>04254+5623</td><td>A 834AB</td><td>3184</td><td>2007.203</td><td>R</td><td>20</td><td>0.712</td><td>0.014</td><td>221.1*</td><td>1.0</td><td></td><td></td><td></td></tr><tr><td>04290+1610</td><td>HU 1080</td><td>3248</td><td>2007.145</td><td>R</td><td>10</td><td>0.216</td><td>0.008</td><td>79.1*</td><td>1.1</td><td></td><td></td><td></td></tr><tr><td>04316+3739</td><td>BU 789</td><td>3275</td><td>2007.203</td><td>R</td><td>20</td><td>0.914</td><td>0.011</td><td>322.0*</td><td>0.9</td><td></td><td></td><td></td></tr><tr><td>04347+1130</td><td>A 2034</td><td>3314</td><td>2007.200</td><td>R</td><td>20</td><td>0.584</td><td>0.017</td><td>235.4</td><td>1.8</td><td>Noisy</td><td></td><td></td></tr><tr><td>04357+3944</td><td>HU 1084</td><td>3315</td><td>2007.096</td><td>R</td><td>20</td><td>0.236</td><td>0.009</td><td>77.1</td><td>1.9</td><td>Noisy</td><td></td><td></td></tr><tr><td>04366+1946</td><td>STT 86</td><td>3329</td><td>2007.096</td><td>R</td><td>20</td><td>0.482</td><td>0.008</td><td>358.8</td><td>0.9</td><td></td><td></td><td></td></tr><tr><td>04367+1930</td><td>STF 567</td><td>3330</td><td>2007.096</td><td>R</td><td>20</td><td>2.069</td><td>0.011</td><td>342.4*</td><td>0.3</td><td>Seymour et al. (2002)</td><td>0.03</td><td>0.9</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.096</td><td>W</td><td>20</td><td>2.011</td><td>0.010</td><td>342.6*</td><td>0.3</td><td>"</td><td>-0.03</td><td>1.1</td></tr></tbody></table>
<table><caption>Table 1 – continued</caption><thead><tr><th>WDS</th><th>Name</th><th>ADS</th><th>Epoch</th><th>Fil.</th><th>Eyep.</th><th>ρ</th><th>σρ</th><th>θ</th><th>σθ</th><th>Notes</th><th>Orbit</th><th>Δρ(O-C)</th><th>Δθ(O-C)</th></tr><tr><th></th><th></th><th></th><th></th><th></th><th>(mm)</th><th>(arcsec)</th><th>(arcsec)</th><th>(°)</th><th>(°)</th><th></th><th></th><th>(arcsec)</th><th>(°)</th></tr></thead><tbody><tr><td>04400+5328</td><td>BU 1295AB</td><td>3358</td><td>2007.091</td><td>R</td><td>10</td><td>0.235</td><td>0.010</td><td>146.3*</td><td>0.9</td><td>Diffuse</td><td>Heintz (1996a)</td><td>-0.01</td><td>0.9</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.197</td><td>R</td><td>10</td><td>0.235</td><td>0.006</td><td>147.8*</td><td>1.1</td><td>Elong.</td><td>"</td><td>-0.01</td><td>2.7</td></tr><tr><td>04400+5328</td><td>STF 566AB-C</td><td>3358</td><td>2007.091</td><td>R</td><td>10</td><td>0.753</td><td>0.009</td><td>180.0*</td><td>0.6</td><td>Diffuse</td><td>Mason et al. (2006)</td><td>-0.03</td><td>-1.6</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>Cvetkovic et al. (2008)</td><td>-0.01</td><td>-1.9</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.197</td><td>R</td><td>10</td><td>0.764</td><td>0.014</td><td>178.8*</td><td>0.3</td><td>Elong.</td><td>Mason et al. (2006)</td><td>-0.02</td><td>-2.7</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>Cvetkovic et al. (2008)</td><td>0.00</td><td>-2.9</td></tr><tr><td>04422+3731</td><td>STF 577</td><td>3390</td><td>2007.167</td><td>R</td><td>20</td><td>0.783</td><td>0.031</td><td>348.7</td><td>1.1</td><td>"</td><td>Mason et al. (2004a)</td><td>0.10</td><td>4.5</td></tr><tr><td>04433+5931</td><td>A 1013</td><td>3391</td><td>2007.192</td><td>R</td><td>10</td><td>0.346</td><td>0.003</td><td>290.9</td><td>1.1</td><td>"</td><td>Docobo & Costa (1990)</td><td>-0.02</td><td>-1.0</td></tr><tr><td>04478+5318</td><td>HU 612</td><td>3434</td><td>2007.197</td><td>R</td><td>10</td><td>0.696</td><td>0.003</td><td>357.5*</td><td>0.3</td><td>"</td><td>Novakovic (2007)</td><td>0.04</td><td>-0.7</td></tr><tr><td>04518+1339</td><td>BU 552AB</td><td>3483</td><td>2007.189</td><td>R</td><td>20</td><td>0.664</td><td>0.014</td><td>249.0*</td><td>3.8</td><td>"</td><td>Söderhjelm (1999)</td><td>0.02</td><td>2.0</td></tr><tr><td>04549+0836</td><td>STT 90AB</td><td>3517</td><td>2007.197</td><td>R</td><td>20</td><td>1.760</td><td>0.017</td><td>339.5*</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>04573+6145</td><td>STT 88</td><td>3526</td><td>2007.156</td><td>R</td><td>20</td><td>0.757</td><td>0.010</td><td>306.7*</td><td>1.1</td><td>"</td><td></td><td></td><td></td></tr><tr><td>04574+4204</td><td>COU1716</td><td>–</td><td>2007.195</td><td>W</td><td>20</td><td>0.698</td><td>0.008</td><td>152.2</td><td>0.9</td><td>"</td><td></td><td></td><td></td></tr><tr><td>04581+0141</td><td>STF 622</td><td>3568</td><td>2007.206</td><td>R</td><td>20</td><td>2.520</td><td>0.027</td><td>163.5</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05003+3924</td><td>STT 92AB</td><td>3589</td><td>2007.192</td><td>R</td><td>20</td><td>4.094</td><td>0.020</td><td>281.5*</td><td>0.3</td><td>"</td><td>Cvetkovic & Novakovic (2006)</td><td>0.03</td><td>0.7</td></tr><tr><td>05005+0506</td><td>STT 93</td><td>3596</td><td>2007.192</td><td>R</td><td>20</td><td>1.540</td><td>0.008</td><td>244.3*</td><td>0.8</td><td>"</td><td>Seymour & Hartkopf (1999)</td><td>0.08</td><td>-0.0</td></tr><tr><td>05055+1948</td><td>STT 95</td><td>3672</td><td>2007.225</td><td>R</td><td>20</td><td>0.933</td><td>0.008</td><td>296.9*</td><td>0.5</td><td>"</td><td>Jasinta (1996)</td><td>-0.02</td><td>-1.2</td></tr><tr><td>05079+0830</td><td>STT 98</td><td>3711</td><td>2007.167</td><td>R</td><td>20</td><td>0.792</td><td>0.011</td><td>303.4*</td><td>0.3</td><td>"</td><td>Scardia et al. (2008a)</td><td>-0.05</td><td>-1.7</td></tr><tr><td>05118+0102</td><td>STF 652</td><td>3764</td><td>2007.091</td><td>R</td><td>20</td><td>1.614</td><td>0.011</td><td>181.5*</td><td>0.6</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05148+1232</td><td>HU 1224</td><td>3822</td><td>2007.195</td><td>R</td><td>20</td><td>1.049</td><td>0.009</td><td>115.4*</td><td>0.6</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05153+4710</td><td>A 1031</td><td>3812</td><td>2007.203</td><td>R</td><td>20</td><td>–</td><td>–</td><td>–</td><td>–</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05157+1944</td><td>STF 665</td><td>3837</td><td>2007.197</td><td>R</td><td>20</td><td>1.688</td><td>0.008</td><td>253.3</td><td>1.0</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05159+0345</td><td>A 2638</td><td>3847</td><td>2007.197</td><td>R</td><td>20</td><td>0.991</td><td>0.011</td><td>277.0</td><td>0.8</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05167+1826</td><td>STF 670A-Bb</td><td>3854</td><td>2007.203</td><td>R</td><td>20</td><td>2.540</td><td>0.017</td><td>165.0*</td><td>0.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05172+3320</td><td>STF 666</td><td>3853</td><td>2007.203</td><td>R</td><td>20</td><td>3.099</td><td>0.032</td><td>74.6*</td><td>0.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05188+5250</td><td>STF 657</td><td>3870</td><td>2007.156</td><td>R</td><td>20</td><td>0.936</td><td>0.011</td><td>307.6</td><td>0.6</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05222+4505</td><td>STF 684</td><td>3932</td><td>2007.192</td><td>R</td><td>20</td><td>1.496</td><td>0.008</td><td>141.0*</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05239–0052</td><td>WNC 2A-BC</td><td>3991</td><td>2007.225</td><td>R</td><td>20</td><td>3.062</td><td>0.015</td><td>159.1*</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05240+2458</td><td>STF 694AB</td><td>3981</td><td>2007.192</td><td>R</td><td>20</td><td>1.365</td><td>0.008</td><td>13.7</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05243+3939</td><td>BU 1317</td><td>3976</td><td>2007.197</td><td>R</td><td>20</td><td>0.712</td><td>0.016</td><td>17.9</td><td>1.1</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05245–0224</td><td>DA 5Aa-B</td><td>4002</td><td>2007.206</td><td>R</td><td>20</td><td>1.794</td><td>0.020</td><td>76.7*</td><td>0.5</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05247+6323</td><td>STF 677</td><td>3956</td><td>2007.083</td><td>R</td><td>20</td><td>1.058</td><td>0.008</td><td>122.9*</td><td>0.4</td><td>"</td><td>Hartkopf et al. (2008a)</td><td>-0.04</td><td>1.0</td></tr><tr><td>05248+6444</td><td>STF 676</td><td>3955</td><td>2007.083</td><td>R</td><td>20</td><td>1.388</td><td>0.014</td><td>267.5</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05265+0256</td><td>STF 712AB</td><td>4033</td><td>2007.206</td><td>R</td><td>20</td><td>3.207</td><td>0.053</td><td>66.1*</td><td>0.9</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05270+2737</td><td>HO 226AB</td><td>4032</td><td>2007.156</td><td>R</td><td>20</td><td>0.647</td><td>0.017</td><td>270.4</td><td>1.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05290+3746</td><td>BU 890</td><td>4060</td><td>2007.197</td><td>R</td><td>20</td><td>1.318</td><td>0.012</td><td>285.3</td><td>0.7</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05297+3523</td><td>HU 217</td><td>4072</td><td>2007.222</td><td>R</td><td>20</td><td>0.659</td><td>0.008</td><td>252.9</td><td>1.5</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05301+2933</td><td>STF 719AB</td><td>4086</td><td>2007.222</td><td>R</td><td>20</td><td>1.255</td><td>0.009</td><td>332.8*</td><td>0.7</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05308+0557</td><td>STF 728</td><td>4115</td><td>2007.206</td><td>R</td><td>20</td><td>1.240</td><td>0.008</td><td>45.6*</td><td>0.7</td><td>"</td><td>Seymour & Hartkopf (1999)</td><td>-0.00</td><td>0.4</td></tr><tr><td>05309+1015</td><td>STF 726</td><td>4113</td><td>2007.203</td><td>R</td><td>20</td><td>1.192</td><td>0.011</td><td>262.1*</td><td>0.7</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05436+1300</td><td>A 117AB</td><td>4304</td><td>2007.222</td><td>W</td><td>20</td><td>0.845</td><td>0.023</td><td>249.3</td><td>1.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05447+3118</td><td>A 1040</td><td>4317</td><td>2007.222</td><td>W</td><td>20</td><td>0.878</td><td>0.018</td><td>87.4*</td><td>0.6</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05460+2119</td><td>STF 787AB</td><td>4349</td><td>2007.225</td><td>R</td><td>20</td><td>0.734</td><td>0.011</td><td>57.5</td><td>1.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05474+2939</td><td>BU 560</td><td>4371</td><td>2007.083</td><td>R</td><td>20</td><td>1.648</td><td>0.013</td><td>125.6*</td><td>0.3</td><td>"</td><td>Scardia et al. (2008c)</td><td>0.00</td><td>-0.4</td></tr><tr><td>05479+0758</td><td>STT 119</td><td>4388</td><td>2007.225</td><td>R</td><td>20</td><td>0.730</td><td>0.008</td><td>351.3*</td><td>0.4</td><td>"</td><td>Scardia et al. (2007a)</td><td>-0.01</td><td>-0.6Q</td></tr><tr><td>05371+2655</td><td>STF 749AB</td><td>4208</td><td>2007.197</td><td>R</td><td>20</td><td>1.148</td><td>0.015</td><td>141.1*</td><td>0.6</td><td>"</td><td>Scardia et al. (2007c)</td><td>-0.01</td><td>-1.9</td></tr><tr><td>05371+4150</td><td>STF 736</td><td>4204</td><td>2007.083</td><td>R</td><td>20</td><td>2.553</td><td>0.013</td><td>359.7*</td><td>0.3</td><td>"</td><td>Novakovic (2007)</td><td>0.05</td><td>1.2</td></tr><tr><td>05491+6248</td><td>STF3115</td><td>4376</td><td>2007.189</td><td>R</td><td>20</td><td>0.831</td><td>0.019</td><td>338.9</td><td>2.1</td><td>"</td><td>Scardia et al. (2007c)</td><td>-0.03</td><td>-0.2</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>Novakovic (2007)</td><td>0.03</td><td>2.9</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.195</td><td>R</td><td>20</td><td>0.816</td><td>0.008</td><td>340.6*</td><td>0.6</td><td>"</td><td></td><td></td><td></td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05500+0952</td><td>HEI 670</td><td>–</td><td>2007.083</td><td>R</td><td>20</td><td>1.069</td><td>0.008</td><td>263.9*</td><td>1.5</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05522+3834</td><td>STF 799</td><td>4452</td><td>2007.083</td><td>R</td><td>20</td><td>0.757</td><td>0.008</td><td>162.1*</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05535+3720</td><td>BU 1053</td><td>4472</td><td>2007.156</td><td>R</td><td>20</td><td>1.796</td><td>0.015</td><td>359.1*</td><td>1.0</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05544+1854</td><td>STF 813</td><td>4490</td><td>2007.192</td><td>R</td><td>20</td><td>3.047</td><td>0.023</td><td>149.4</td><td>0.5</td><td>"</td><td></td><td></td><td></td></tr><tr><td>05597+2228</td><td>STT 125</td><td>4577</td><td>2007.156</td><td>R</td><td>20</td><td>1.388</td><td>0.011</td><td>0.4</td><td>1.2</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06117+1723</td><td>STF 867AB</td><td>4789</td><td>2007.096</td><td>R</td><td>20</td><td>2.184</td><td>0.020</td><td>158.0</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06145+1754</td><td>KUI 24</td><td>–</td><td>2007.200</td><td>R</td><td>10</td><td>0.364</td><td>0.004</td><td>142.8*</td><td>0.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06221+5922</td><td>STF 881Aa-B</td><td>4950</td><td>2007.195</td><td>R</td><td>20</td><td>0.656</td><td>0.008</td><td>144.8*</td><td>0.4</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06344+1445</td><td>STF 932</td><td>5197</td><td>2007.203</td><td>R</td><td>20</td><td>1.677</td><td>0.017</td><td>306.6*</td><td>0.3</td><td>"</td><td>Hopmann (1960a)</td><td>0.02</td><td>3.2</td></tr><tr><td>06347+3832</td><td>STF 928AB</td><td>5191</td><td>2007.195</td><td>R</td><td>20</td><td>3.457</td><td>0.021</td><td>131.6*</td><td>0.3</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06364+2717</td><td>STT 149</td><td>5234</td><td>2007.096</td><td>R</td><td>20</td><td>0.695</td><td>0.017</td><td>289.3*</td><td>0.7</td><td>"</td><td></td><td></td><td></td></tr><tr><td>06384+2859</td><td>MCA 27</td><td>–</td><td>2007.200</td><td>R</td><td>10</td><td>0.157</td><td>0.004</td><td>96.7*</td><td>0.9</td><td>"</td><td>Hartkopf & Mason (2000)</td><td>-0.02</td><td>-3.6Q</td></tr></tbody></table>
<table><caption>Table 1 – continued</caption><thead><tr><th>WDS</th><th>Name</th><th>ADS</th><th>Epoch</th><th>Fil.</th><th>Eyep.</th><th>ρ</th><th>σρ</th><th>θ</th><th>σθ</th><th>Notes</th><th>Orbit</th><th>Δρ(O-C)</th><th>Δθ(O-C)</th></tr><tr><th></th><th></th><th></th><th></th><th></th><th>(mm)</th><th>(arcsec)</th><th>(arcsec)</th><th>(°)</th><th>(°)</th><th></th><th></th><th>(arcsec)</th><th>(°)</th></tr></thead><tbody><tr><td>06387+4135</td><td>STF 941AB</td><td>5269</td><td>2007.096</td><td>R</td><td>20</td><td>1.885</td><td>0.009</td><td>82.9*</td><td>0.3</td><td></td><td>Novakovic (2007)</td><td>-0.01</td><td>-0.7</td></tr><tr><td>06392+0939</td><td>STH 1</td><td>5290</td><td>2007.097</td><td>R</td><td>20</td><td>0.717</td><td>0.017</td><td>285.1</td><td>0.9</td><td></td><td></td><td></td><td></td></tr><tr><td>06404+4058</td><td>STF 945</td><td>5296</td><td>2007.225</td><td>R</td><td>20</td><td>0.465</td><td>0.011</td><td>329.2*</td><td>0.6</td><td></td><td></td><td></td><td></td></tr><tr><td>06410+0954</td><td>STF 950Aa,B</td><td>5322</td><td>2007.260</td><td>R</td><td>20</td><td>2.940</td><td>0.035</td><td>213.4*</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>06425+6612</td><td>MLR 318</td><td>-</td><td>2007.263</td><td>R</td><td>20</td><td>1.669</td><td>0.026</td><td>308.0*</td><td>0.5</td><td></td><td>Pavlovic & Todorovic (2005)</td><td>0.01</td><td>-0.7</td></tr><tr><td>06462+5927</td><td>STF 948AB</td><td>5400</td><td>2007.192</td><td>R</td><td>20</td><td>1.885</td><td>0.009</td><td>69.6*</td><td>0.3</td><td></td><td>Mason et al. (2006)</td><td>0.02</td><td>-0.2</td></tr><tr><td>06474+1812</td><td>STT 156</td><td>5447</td><td>2007.200</td><td>R</td><td>10</td><td>0.246</td><td>0.003</td><td>187.6</td><td>0.7</td><td></td><td>Scardia et al. (2005)</td><td>-0.01</td><td>1.6</td></tr><tr><td>06487+0737</td><td>A 2731AB</td><td>5469</td><td>2007.198</td><td>R</td><td>20</td><td>1.301</td><td>0.011</td><td>63.9*</td><td>0.6</td><td></td><td>Heintz (1998)</td><td>-0.06</td><td>-1.7</td></tr><tr><td>06531+5927</td><td>STF 963AB</td><td>5514</td><td>2007.083</td><td>R</td><td>10</td><td>0.232</td><td>0.007</td><td>328.4</td><td>0.9</td><td></td><td>Scardia et al. (2008a)</td><td>-0.00</td><td>0.4</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.192</td><td>R</td><td>10</td><td>0.237</td><td>0.003</td><td>329.8*</td><td>0.7</td><td></td><td>"</td><td>0.00</td><td>1.5</td></tr><tr><td>06573+5825</td><td>STT 159AB</td><td>5586</td><td>2007.192</td><td>R</td><td>10</td><td>0.615</td><td>0.003</td><td>228.8*</td><td>0.4</td><td></td><td>Alzner (2000)</td><td>-0.01</td><td>0.1</td></tr><tr><td>07128+2713</td><td>STF1037AB</td><td>5871</td><td>2007.157</td><td>R</td><td>20</td><td>1.048</td><td>0.010</td><td>309.4</td><td>0.9</td><td></td><td>Söderhjelm (1999)</td><td>-0.02</td><td>-1.2</td></tr><tr><td>07303+4959</td><td>STF1093</td><td>6117</td><td>2007.195</td><td>R</td><td>20</td><td>0.876</td><td>0.010</td><td>201.3</td><td>2.1</td><td></td><td>Scardia (1984)</td><td>0.08</td><td>0.1</td></tr><tr><td>07346+3153</td><td>STF1110AB</td><td>6175</td><td>2007.206</td><td>V</td><td>20</td><td>4.481</td><td>0.022</td><td>59.4*</td><td>0.3</td><td></td><td>Docobo & Costa (1985)</td><td>0.04</td><td>0.5</td></tr><tr><td>07351+3058</td><td>STT 175AB</td><td>6185</td><td>2007.263</td><td>R</td><td>10</td><td>-</td><td>-</td><td>-</td><td>-</td><td>Unres.</td><td>Hartkopf et al. (1989)</td><td>(0.05)</td><td>(122.9)</td></tr><tr><td>07417+3726</td><td>STT 177</td><td>6276</td><td>2007.192</td><td>R</td><td>20</td><td>0.518</td><td>0.018</td><td>151.0*</td><td>0.7</td><td></td><td>Heintz (1982)</td><td>0.00</td><td>2.2</td></tr><tr><td>07486+2308</td><td>WRH 15AB</td><td>6378</td><td>2007.192</td><td>R</td><td>10</td><td>0.274</td><td>0.004</td><td>34.8</td><td>0.5</td><td></td><td>Seymour et al. (2002)</td><td>0.00</td><td>0.8</td></tr><tr><td>07556+3630</td><td>COU2075</td><td>-</td><td>2007.157</td><td>W</td><td>20</td><td>0.795</td><td>0.010</td><td>140.1*</td><td>1.5</td><td></td><td></td><td></td><td></td></tr><tr><td>07573+0108</td><td>STT 185</td><td>6483</td><td>2007.263</td><td>R</td><td>10</td><td>0.241</td><td>0.006</td><td>8.2</td><td>1.0</td><td></td><td>Hartkopf & Mason (2001)</td><td>-0.10</td><td>-5.3</td></tr><tr><td>07598+1341</td><td>STF1170</td><td>6499</td><td>2007.198</td><td>R</td><td>20</td><td>2.384</td><td>0.014</td><td>106.3*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08024+0409</td><td>STF1175</td><td>6532</td><td>2007.198</td><td>R</td><td>20</td><td>1.405</td><td>0.008</td><td>280.5*</td><td>0.4</td><td></td><td>Olevic & Jovanovic (2001)</td><td>0.04</td><td>-5.1</td></tr><tr><td>08033+2616</td><td>STT 186</td><td>6538</td><td>2007.203</td><td>R</td><td>20</td><td>0.974</td><td>0.008</td><td>73.5*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08041+3302</td><td>STT 187</td><td>6549</td><td>2007.200</td><td>R</td><td>10</td><td>0.407</td><td>0.006</td><td>341.1</td><td>0.8</td><td></td><td>Mason et al. (1999)</td><td>0.00</td><td>-0.5</td></tr><tr><td>08056+2732</td><td>STF1177</td><td>6569</td><td>2007.299</td><td>R</td><td>20</td><td>3.480</td><td>0.017</td><td>349.4*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08061-0047</td><td>A 1971</td><td>6582</td><td>2007.200</td><td>W</td><td>20</td><td>0.937</td><td>0.032</td><td>6.4</td><td>0.4</td><td></td><td>Olevic et al. (1993)</td><td>0.07</td><td>3.0</td></tr><tr><td>08095+3213</td><td>STF1187Aa-B</td><td>6623</td><td>2007.192</td><td>R</td><td>20</td><td>2.996</td><td>0.015</td><td>22.5*</td><td>0.3</td><td></td><td>Olevic & Jovanovic (2001)</td><td>0.07</td><td>0.9</td></tr><tr><td>08122+1739</td><td>STF1196AB</td><td>6650</td><td>2007.192</td><td>R</td><td>10</td><td>1.016</td><td>0.005</td><td>50.0</td><td>0.3</td><td></td><td>Mason et al. (2006)</td><td>0.01</td><td>1.2</td></tr><tr><td>08198+0357</td><td>FIN 346</td><td>-</td><td>2007.225</td><td>R</td><td>10</td><td>0.261</td><td>0.003</td><td>59.6</td><td>0.7</td><td></td><td></td><td></td><td></td></tr><tr><td>08213-0136</td><td>STF1216</td><td>6762</td><td>2007.200</td><td>R</td><td>20</td><td>0.512</td><td>0.022</td><td>298.8*</td><td>1.3</td><td></td><td>Docobo (1994)</td><td>0.05</td><td>-2.9</td></tr><tr><td>08432+3849</td><td>BU 209</td><td>6946</td><td>2007.299</td><td>R</td><td>20</td><td>1.279</td><td>0.010</td><td>8.2</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08468+0625</td><td>STF1273AB-C</td><td>6993</td><td>2007.198</td><td>R</td><td>20</td><td>2.767</td><td>0.014</td><td>301.5*</td><td>0.3</td><td></td><td>Heintz (1996a)</td><td>-0.11</td><td>-1.4</td></tr><tr><td>08468+0625</td><td>SP 1AB</td><td>6993</td><td>2007.198</td><td>V</td><td>10</td><td>0.151</td><td>0.004</td><td>108.1</td><td>0.6</td><td></td><td>Hartkopf, Mason & McAlister<br>(1996)</td><td>0.00</td><td>1.3</td></tr><tr><td>08507+1800</td><td>A 2473</td><td>7039</td><td>2007.225</td><td>R</td><td>10</td><td>0.268</td><td>0.003</td><td>77.3</td><td>1.0</td><td></td><td>Hartkopf & Mason (2000)</td><td>0.04</td><td>-2.8</td></tr><tr><td>08508+3504</td><td>STF1282</td><td>7034</td><td>2007.323</td><td>R</td><td>20</td><td>3.525</td><td>0.020</td><td>278.0*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08514+5732</td><td>STF1275AB</td><td>7033</td><td>2007.323</td><td>R</td><td>20</td><td>1.875</td><td>0.018</td><td>198.7</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>08531+5457</td><td>A 1584</td><td>7054</td><td>2007.192</td><td>R</td><td>20</td><td>0.652</td><td>0.008</td><td>79.7</td><td>1.2</td><td></td><td>Heintz (1991)</td><td>0.02</td><td>-3.3</td></tr><tr><td>08539+1958</td><td>COU 773</td><td>-</td><td>2007.288</td><td>R</td><td>10</td><td>-</td><td>-</td><td>-</td><td>-</td><td>Diffuse</td><td>Couteau (1999)</td><td>(0.19)</td><td>(55.4)</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.293</td><td>R</td><td>10</td><td>0.165</td><td>0.003</td><td>62.2</td><td>1.8</td><td></td><td>"</td><td>-0.03</td><td>6.8</td></tr><tr><td>08542+3035</td><td>STF1291AB</td><td>7071</td><td>2007.200</td><td>R</td><td>20</td><td>1.509</td><td>0.011</td><td>310.1*</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>08554+7048</td><td>STF1280AB</td><td>7067</td><td>2007.225</td><td>R</td><td>20</td><td>2.038</td><td>0.032</td><td>348.6</td><td>0.3</td><td></td><td>Heintz (1997)</td><td>0.02</td><td>0.1</td></tr><tr><td>08580+3014</td><td>HO 252</td><td>7107</td><td>2007.203</td><td>R</td><td>10</td><td>-</td><td>-</td><td>-</td><td>-</td><td>Unres.</td><td></td><td></td><td></td></tr><tr><td>09006+4147</td><td>KUI 37AB</td><td>-</td><td>2007.203</td><td>R</td><td>10</td><td>0.523</td><td>0.003</td><td>329.9*</td><td>0.7</td><td></td><td></td><td></td><td></td></tr><tr><td>09033+4740</td><td>HU 720</td><td>7153</td><td>2007.299</td><td>R</td><td>20</td><td>0.750</td><td>0.014</td><td>133.2</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>09036+4709</td><td>A 1585</td><td>7158</td><td>2007.203</td><td>R</td><td>10</td><td>0.208</td><td>0.005</td><td>297.6*</td><td>0.9</td><td></td><td>Barnaby et al. (2000)</td><td>-0.00</td><td>0.5</td></tr><tr><td>09104+6708</td><td>STF1306AB</td><td>7203</td><td>2007.198</td><td>R</td><td>20</td><td>4.114</td><td>0.021</td><td>350.8*</td><td>0.3</td><td></td><td>Scardia (1985)</td><td>0.06</td><td>-0.1</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.277</td><td>R</td><td>20</td><td>4.177</td><td>0.051</td><td>350.7*</td><td>0.3</td><td></td><td>"</td><td>0.12</td><td>-0.1</td></tr><tr><td>09127+1632</td><td>STF1322</td><td>7236</td><td>2007.277</td><td>R</td><td>20</td><td>1.770</td><td>0.014</td><td>53.0*</td><td>0.7</td><td></td><td></td><td></td><td></td></tr><tr><td>09179+2834</td><td>STF3121AB</td><td>7284</td><td>2007.192</td><td>R</td><td>20</td><td>0.698</td><td>0.008</td><td>209.1</td><td>0.6</td><td></td><td>Söderhjelm (1999)</td><td>-0.01</td><td>2.3</td></tr><tr><td>09184+3522</td><td>STF1333</td><td>7286</td><td>2007.200</td><td>R</td><td>20</td><td>1.938</td><td>0.010</td><td>49.0*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>09188+3648</td><td>STF1334A-Bb</td><td>7292</td><td>2007.260</td><td>R</td><td>20</td><td>2.667</td><td>0.026</td><td>224.2*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>09208+6121</td><td>STF1331AB</td><td>7300</td><td>2007.277</td><td>R</td><td>20</td><td>0.931</td><td>0.014</td><td>153.0*</td><td>0.9</td><td></td><td></td><td></td><td></td></tr><tr><td>09210+3811</td><td>STF1338AB</td><td>7307</td><td>2007.260</td><td>R</td><td>20</td><td>1.059</td><td>0.014</td><td>297.1*</td><td>0.9</td><td></td><td>Scardia et al. (2002b)</td><td>0.05</td><td>-2.3</td></tr><tr><td>09245+0621</td><td>STF1348AB</td><td>7352</td><td>2007.263</td><td>R</td><td>20</td><td>1.926</td><td>0.019</td><td>313.4</td><td>0.8</td><td></td><td></td><td></td><td></td></tr><tr><td>09245+1808</td><td>A 2477</td><td>7341</td><td>2007.198</td><td>R</td><td>10</td><td>0.442</td><td>0.006</td><td>356.2</td><td>0.3</td><td></td><td>Mason & Hartkopf (1998)</td><td>-0.03</td><td>0.6</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.198</td><td>R</td><td>10</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>Aristidi et al. (1999)</td><td>0.05</td><td>-2.9</td></tr><tr><td>09249+5134</td><td>STT 200</td><td>7348</td><td>2007.293</td><td>R</td><td>20</td><td>1.222</td><td>0.030</td><td>336.6*</td><td>0.8</td><td></td><td></td><td></td><td></td></tr><tr><td>09273+0614</td><td>STF1355</td><td>7380</td><td>2007.260</td><td>R</td><td>20</td><td>1.869</td><td>0.009</td><td>352.5*</td><td>0.8</td><td></td><td></td><td></td><td></td></tr><tr><td>09285+0903</td><td>STF1356</td><td>7390</td><td>2007.288</td><td>R</td><td>10</td><td>0.686</td><td>0.005</td><td>97.8*</td><td>0.3</td><td></td><td>van Dessel (1976)</td><td>-0.01</td><td>-1.2</td></tr><tr><td>09300+4216</td><td>A 1985</td><td>7398</td><td>2007.293</td><td>R</td><td>20</td><td>1.541</td><td>0.010</td><td>24.2</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>09327+0152</td><td>FIN 349</td><td>-</td><td>2007.263</td><td>R</td><td>10</td><td>-</td><td>-</td><td>-</td><td>-</td><td>Unres.</td><td>Hartkopf (2000)</td><td>(0.14)</td><td>(122.5)</td></tr><tr><td>09414+3857</td><td>STF1374AB</td><td>7477</td><td>2007.203</td><td>R</td><td>20</td><td>2.815</td><td>0.014</td><td>308.0*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>09513+6037</td><td>STF1381</td><td>7536</td><td>2007.293</td><td>R</td><td>20</td><td>0.876</td><td>0.014</td><td>187.8*</td><td>0.5</td><td></td><td></td><td></td><td></td></tr></tbody></table>
<table><caption>Table 1 – continued</caption><thead><tr><th>WDS</th><th>Name</th><th>ADS</th><th>Epoch</th><th>Fil.</th><th>Eyep.</th><th>ρ</th><th>σρ</th><th>θ</th><th>σθ</th><th>Notes</th><th>Orbit</th><th>Δρ(O-C)</th><th>Δθ(O-C)</th></tr><tr><th></th><th></th><th></th><th></th><th></th><th>(mm)</th><th>(arcsec)</th><th>(arcsec)</th><th>(°)</th><th>(°)</th><th></th><th></th><th>(arcsec)</th><th>(°)</th></tr></thead><tbody><tr><td>09521+5404</td><td>STT 208</td><td>7545</td><td>2007.261</td><td>R</td><td>10</td><td>0.325</td><td>0.004</td><td>285.4*</td><td>0.4</td><td></td><td>Heintz (1996b)</td><td>-0.03</td><td>-1.8</td></tr><tr><td>10056+3105</td><td>STF1406</td><td>7632</td><td>2007.293</td><td>R</td><td>20</td><td>0.789</td><td>0.011</td><td>217.3</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10057+4103</td><td>A 2142</td><td>7631</td><td>2007.198</td><td>R</td><td>20</td><td>1.022</td><td>0.010</td><td>294.6*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10151+1907</td><td>STF1417</td><td>7695</td><td>2007.293</td><td>W</td><td>20</td><td>2.338</td><td>0.018</td><td>77.4</td><td>0.7</td><td></td><td></td><td></td><td></td></tr><tr><td>10163+1744</td><td>STT 215</td><td>7704</td><td>2007.288</td><td>R</td><td>20</td><td>1.424</td><td>0.010</td><td>177.9*</td><td>0.3</td><td></td><td>Zaera (1984)</td><td>-0.10</td><td>-1.7</td></tr><tr><td>10205+0626</td><td>STF1426AB</td><td>7730</td><td>2007.293</td><td>R</td><td>20</td><td>0.916</td><td>0.008</td><td>309.3*</td><td>0.7</td><td></td><td>Novakovic (2006)</td><td>-0.00</td><td>-1.3</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>Scardia et al. (2008c)</td><td>0.01</td><td>-1.2</td></tr><tr><td>10250+2437</td><td>STF1429</td><td>7758</td><td>2007.192</td><td>W</td><td>20</td><td>0.746</td><td>0.011</td><td>160.4</td><td>0.4</td><td></td><td>Zulevic (1981)</td><td>0.04</td><td>-1.7</td></tr><tr><td>10260+5237</td><td>STF1428</td><td>7762</td><td>2007.277</td><td>R</td><td>20</td><td>2.876</td><td>0.041</td><td>87.4*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10269+1713</td><td>STT 217</td><td>7775</td><td>2007.261</td><td>R</td><td>20</td><td>0.737</td><td>0.010</td><td>145.9*</td><td>0.9</td><td></td><td>Heintz (1975)</td><td>0.02</td><td>-1.9</td></tr><tr><td>10279+3642</td><td>HU 879</td><td>7780</td><td>2007.288</td><td>R</td><td>10</td><td>0.457</td><td>0.003</td><td>222.1*</td><td>0.4</td><td></td><td>Mason & Hartkopf (2001)</td><td>0.01</td><td>1.4</td></tr><tr><td>10350+0839</td><td>STF1450</td><td>7837</td><td>2007.277</td><td>R</td><td>20</td><td>2.117</td><td>0.019</td><td>156.4*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10397+0851</td><td>STT 224</td><td>7871</td><td>2007.288</td><td>R</td><td>20</td><td>0.498</td><td>0.008</td><td>142.2</td><td>0.6</td><td></td><td>Heintz (1984)</td><td>-0.08</td><td>-8.4</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>This paper</td><td>0.03</td><td>-1.3</td></tr><tr><td>10406+4209</td><td>STF1460</td><td>7878</td><td>2007.293</td><td>R</td><td>20</td><td>3.743</td><td>0.021</td><td>161.7*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10426+0335</td><td>A 2768</td><td>7896</td><td>2007.261</td><td>R</td><td>20</td><td>0.579</td><td>0.008</td><td>253.8*</td><td>0.3</td><td></td><td>Hartkopf et al. (1989)</td><td>0.03</td><td>-0.1</td></tr><tr><td>10480+4107</td><td>STT 229</td><td>7929</td><td>2007.261</td><td>R</td><td>20</td><td>0.685</td><td>0.008</td><td>265.6</td><td>0.6</td><td></td><td>Alzner (1998)</td><td>0.01</td><td>1.9</td></tr><tr><td>10493-0401</td><td>STF1476</td><td>7936</td><td>2007.277</td><td>R</td><td>20</td><td>2.414</td><td>0.013</td><td>16.0*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>10557+0044</td><td>BU 1076</td><td>7982</td><td>2007.323</td><td>R</td><td>20</td><td>1.155</td><td>0.012</td><td>56.8*</td><td>0.8</td><td></td><td>Scardia et al. (2008b)</td><td>0.04</td><td>1.5</td></tr><tr><td>11000-0328</td><td>STF1500</td><td>8007</td><td>2007.299</td><td>R</td><td>20</td><td>1.370</td><td>0.008</td><td>300.8</td><td>0.5</td><td></td><td></td><td></td><td></td></tr><tr><td>11037+6145</td><td>BU 1077AB</td><td>8035</td><td>2007.299</td><td>V</td><td>10</td><td>0.461</td><td>0.003</td><td>44.2*</td><td>0.5</td><td></td><td>Scardia et al. (2005)</td><td>-0.03</td><td>-5.4</td></tr><tr><td>11050+3825</td><td>HO 378AB</td><td>8047</td><td>2007.293</td><td>R</td><td>20</td><td>1.034</td><td>0.012</td><td>236.9</td><td>0.6</td><td></td><td></td><td></td><td></td></tr><tr><td>11136+5525</td><td>A 1353</td><td>8092</td><td>2007.323</td><td>R</td><td>20</td><td>0.556</td><td>0.012</td><td>214.9</td><td>1.3</td><td></td><td>Docobo & Ling (1999)</td><td>0.01</td><td>2.2</td></tr><tr><td>11137+2008</td><td>STF1517AB</td><td>8094</td><td>2007.261</td><td>W</td><td>10</td><td>0.603</td><td>0.015</td><td>317.5</td><td>1.1</td><td>Elong.</td><td>Hopmann (1970)</td><td>0.37</td><td>10.6</td></tr><tr><td>11154+2734</td><td>STF1521</td><td>8105</td><td>2007.299</td><td>R</td><td>20</td><td>3.656</td><td>0.018</td><td>97.3*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>11182+3132</td><td>STF1523AB</td><td>8119</td><td>2007.288</td><td>R</td><td>20</td><td>1.636</td><td>0.008</td><td>228.7*</td><td>0.6</td><td></td><td>Mason et al. (1995)</td><td>-0.02</td><td>-1.9</td></tr><tr><td>11190+1416</td><td>STF1527</td><td>8128</td><td>2007.277</td><td>R</td><td>10</td><td>0.288</td><td>0.004</td><td>147.0</td><td>0.3</td><td></td><td>Mason et al. (2004b)</td><td>-0.04</td><td>12.5</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>Mason et al. (2006)</td><td>-0.15</td><td>-200.2</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>This paper</td><td>-0.01</td><td>0.3</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.288</td><td>R</td><td>10</td><td>0.284</td><td>0.004</td><td>146.7</td><td>0.5</td><td></td><td>Mason et al. (2004b)</td><td>-0.04</td><td>12.0</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>Mason et al. (2006)</td><td>-0.16</td><td>-200.6</td></tr><tr><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td>"</td><td></td><td>This paper</td><td>-0.01</td><td>-0.1</td></tr><tr><td>11239+1032</td><td>STF1536AB</td><td>8148</td><td>2007.288</td><td>R</td><td>20</td><td>1.918</td><td>0.011</td><td>103.0*</td><td>0.3</td><td></td><td>Söderhjelm (1999)</td><td>0.02</td><td>-0.0</td></tr><tr><td>11308+4117</td><td>STT 234</td><td>8189</td><td>2007.323</td><td>R</td><td>20</td><td>0.543</td><td>0.026</td><td>168.1</td><td>1.7</td><td></td><td>Docobo & Ling (2001)</td><td>0.05</td><td>-0.3</td></tr><tr><td>11347+1648</td><td>STF1552AB</td><td>8220</td><td>2007.381</td><td>R</td><td>20</td><td>3.531</td><td>0.074</td><td>207.9*</td><td>0.7</td><td>Elong.</td><td></td><td></td><td></td></tr><tr><td>11363+2747</td><td>STF1555AB</td><td>8231</td><td>2007.324</td><td>R</td><td>10</td><td>0.714</td><td>0.014</td><td>148.6</td><td>0.8</td><td></td><td>Docobo & Ling (2007b)</td><td>0.02</td><td>-0.3</td></tr><tr><td>11390+4109</td><td>STT 237</td><td>8252</td><td>2007.356</td><td>R</td><td>20</td><td>2.043</td><td>0.010</td><td>244.8*</td><td>0.3</td><td></td><td>Seymour et al. (2002)</td><td>0.04</td><td>-0.5</td></tr><tr><td>11447-0431</td><td>RST4484</td><td>—</td><td>2007.378</td><td>R</td><td>20</td><td>0.746</td><td>0.018</td><td>63.8</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>11486+1417</td><td>BU 603</td><td>8311</td><td>2007.356</td><td>R</td><td>20</td><td>0.998</td><td>0.008</td><td>336.6*</td><td>0.6</td><td></td><td>Brendley & Mason (2006)</td><td>-0.08</td><td>-0.4</td></tr><tr><td>11563+3527</td><td>STT 241</td><td>8355</td><td>2007.356</td><td>R</td><td>20</td><td>1.763</td><td>0.009</td><td>144.0*</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>12372+2112</td><td>STF1663</td><td>8611</td><td>2007.356</td><td>R</td><td>20</td><td>0.640</td><td>0.017</td><td>70.1</td><td>2.7</td><td>Faint</td><td></td><td></td><td></td></tr><tr><td>12417-0127</td><td>STF1670AB</td><td>8630</td><td>2007.324</td><td>R</td><td>10</td><td>0.726</td><td>0.004</td><td>52.9</td><td>0.3</td><td>Elong.</td><td>Scardia et al. (2007b)</td><td>-0.02</td><td>0.4</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.356</td><td>R</td><td>10</td><td>0.744</td><td>0.004</td><td>51.9*</td><td>0.3</td><td>Elong.</td><td>"</td><td>-0.01</td><td>0.0</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.378</td><td>R</td><td>20</td><td>0.754</td><td>0.008</td><td>51.5*</td><td>0.4</td><td></td><td>"</td><td>-0.01</td><td>0.1</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.381</td><td>V</td><td>20</td><td>0.758</td><td>0.010</td><td>51.4*</td><td>0.3</td><td>Elong.</td><td>"</td><td>-0.00</td><td>0.0</td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.384</td><td>R</td><td>10</td><td>0.749</td><td>0.004</td><td>51.5*</td><td>0.3</td><td></td><td>"</td><td>-0.01</td><td>0.2</td></tr><tr><td>12564-0057</td><td>STT 256</td><td>8708</td><td>2007.378</td><td>W</td><td>20</td><td>1.049</td><td>0.008</td><td>98.3</td><td>0.5</td><td></td><td></td><td></td><td></td></tr><tr><td>12587+2728</td><td>STF1699</td><td>8721</td><td>2007.378</td><td>W</td><td>20</td><td>1.681</td><td>0.011</td><td>8.3</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>13007+5622</td><td>BU 1082</td><td>8739</td><td>2007.378</td><td>R</td><td>20</td><td>1.173</td><td>0.010</td><td>94.5*</td><td>0.3</td><td></td><td>Scardia et al. (2005)</td><td>-0.11</td><td>1.7</td></tr><tr><td>13084+1529</td><td>STF1722</td><td>8796</td><td>2007.378</td><td>W</td><td>20</td><td>2.657</td><td>0.013</td><td>336.6*</td><td>0.4</td><td></td><td></td><td></td><td></td></tr><tr><td>13243+0124</td><td>STF1742</td><td>8890</td><td>2007.381</td><td>R</td><td>20</td><td>0.982</td><td>0.036</td><td>357.8</td><td>0.7</td><td>Elong.</td><td></td><td></td><td></td></tr><tr><td>"</td><td>"</td><td>"</td><td>2007.384</td><td>R</td><td>20</td><td>0.985</td><td>0.024</td><td>356.1*</td><td>0.3</td><td></td><td></td><td></td><td></td></tr><tr><td>13258+4430</td><td>A 1609AB</td><td>8901</td><td>2007.384</td><td>R</td><td>20</td><td>0.471</td><td>0.008</td><td>28.4</td><td>1.3</td><td></td><td>Heintz (1991)</td><td>-0.00</td><td>1.3</td></tr><tr><td>13329+3454</td><td>STT 269AB</td><td>8939</td><td>2007.384</td><td>R</td><td>10</td><td>0.272</td><td>0.004</td><td>220.0</td><td>0.5</td><td></td><td>Heintz (1997)</td><td>-0.02</td><td>-1.0</td></tr><tr><td>13368+0650</td><td>A 1611</td><td>8968</td><td>2007.384</td><td>W</td><td>20</td><td>0.879</td><td>0.008</td><td>120.8*</td><td>0.4</td><td></td><td></td><td></td><td></td></tr></tbody></table>

Note. In column 9, the exponent * indicates that the position angle $\theta$ could be determined without the 180° ambiguity.

In column 14, the exponent $\theta$ indicates discrepant quadrants between our measurements and the published orbits.

ADS - Aitken Double Star catalogue (Aitken 1932).
<figure><img src="image_3.png" /><figcaption>**Figure 2.** Restored images of ADS 4208 (a) and MCA 27 (b), obtained with bispectral methods.</figcaption></figure>

the unresolved objects (see Section 3.2), the quantities in brackets in columns 13 and 14 are the ephemeris values themselves, not the residuals. For ADS 7871, 7982 and 8128, we also give the residuals obtained with our new orbits presented in Section 4, for comparison.

For most of the orbits used for computing the residuals reported in Table 1, the equinox of the node $\Omega$ was 2000.0, and the correction to be applied to our angular measurements is negligible. Such a correction was only necessary for ADS 1737, 5197 and 7390, for which the tabulated equinox is 1900.0 in OC6.

We noted a 180° discrepancy of the position angle between our measurements and the published ephemerides for ADS 4208 and MCA 27. This is indicated with the superscript $^Q$ in column 14.

The residuals reported in Table 1 were computed with the most recent orbits found in OC6, but for some objects (i.e. for ADS 3358, 4376, 7341, 7730 and 8128), we also give the $O-C$ values relative to old orbits found in the previous issues of OC6, when they are still valid. For ADS 4371 and 7730, we used our recent orbits published in Scardia et al. (2008c) that were computed using some of the PISCO measurements reported in Table 1.

Fig. 3 shows that the residuals are well centred around the origin, with a rather large scatter that can be explained by the (old) age of many orbits. When discarding the two outliers relative to ADS 8094 and 8128, the mean values computed with the residuals of Table 1

<figure><img src="image_4.png" /><figcaption>**Figure 3.** Residuals of our measurements from the published orbits. The data points of the residuals of ADS 8128, computed with Mason et al. (2006)'s orbit, lie outside of this frame.</figcaption></figure>

are $\langle\Delta\rho_{O-C}\rangle = 0.00 \pm 0.04$ arcsec and $\langle\Delta\theta_{O-C}\rangle = -0.2 \pm 2.2$. The small values obtained for those offsets provide an additional validation of our calibration made with a grating mask (see Paper III), which is thus in good agreement with the measurements made by the other observers. Let us now examine the cases of ADS 7871, 8094 and 8128 that appear with the largest residuals in Fig. 3.

ADS 7871: as shown by Fig. 3, the residuals computed with Heintz (1984)'s orbit are rather large. We propose new orbital elements in Section 4.

ADS 8094: Hopmann (1970)'s orbit leads to a large residual of (0.37 arcsec, 10.6) with our measurement of 2007.261. Clearly, this orbit is wrong, as already pointed out in Paper III. The motion appears to be rectilinear and is, in any case, too short to attempt a meaningful orbital analysis at present.

ADS 8128: our measurements of 2007.277 and 2007.288 have very large residuals of ($-0.15$ arcsec, $-200.2$) and ($-0.16$ arcsec, $-200.6$), respectively, and are thus in complete disagreement with the ephemerides computed with Mason et al. (2006)'s orbit. The residuals are smaller with the previous orbit published by Mason et al. (2004b), but they are still significant with $\Delta\theta_{O-C} \approx 12^\circ$. This is surprising since those two orbits are recent. Alzner (2008) also reported position angle and separation values similar to ours, for the same epoch (2007.3). Mason's orbits clearly need to be revised. We propose a new orbit in Section 4.

# 4 REVISED ORBITS FOR ADS 7871, 7982 AND 8128

In this section, we present the new orbits we have computed for ADS 7871 and 8128, which are the two objects with the largest residuals in Fig. 3, and for ADS 7982, whose orbit has not been revised for nearly 40 yr.

We have followed the same method for the three objects. Using our last measurements with PISCO and the other available observations contained in the data base maintained by the US Naval Observatory, we first computed the preliminary orbital elements with the analytical method of Kowalsky (1873). We then used them as initial values for the least-squares method of Hellerich (1925), which leads to an improvement of the orbital elements with an estimation of their errors.

The final orbital elements are presented in Table 2 with the same format as for the previous papers (see for instance its description in Paper VI). The corresponding ($O-C$) residuals, restricted to the last observations for reasons of space, are given in Tables 3–5 for ADS 7871, 7982 and 8128, respectively. For each measurement, the date in Besselian years is given in column 1, and the ($O-C$) residuals in $\rho$ and $\theta$ in columns 2 and 3, respectively. In column 4, we report the name of the observer, using the US Naval Observatory convention. For ADS 8128, we also add an unpublished speckle measurement made by René Gili with the 76-cm Nice Observatory refractor.

The apparent orbits are shown in Fig. 4 as solid lines and the observational data used for the calculation of the orbital elements are plotted as small crosses or, in the case of PISCO observations, as filled circles. The orientation of the graphs conforms to the convention adopted by the observers of visual binary stars. For each object, the big cross indicates the location of the primary component, and the straight line going through this point is the line of apsides. The sense of rotation of the companion is indicated with an arrow.

The ephemerides for 2009–2018 are presented in Table 6, with the date in Besselian years in column 1, the angular separations $\rho$
<table><caption>**Table 2.** New orbital elements of ADS 7871, 7982 and 8128.</caption><thead><tr><th>ADS</th><th>Ω<sub>2000</sub><br>(°)</th><th>ω<br>(°)</th><th>i<br>(°)</th><th>e</th><th>T<br>(yr)</th><th>P<br>(yr)</th><th>n<br>(°/yr)</th><th>a<br>(arcsec)</th><th>A<br>(arcsec)</th><th>B<br>(arcsec)</th><th>F<br>(arcsec)</th><th>G<br>(arcsec)</th></tr></thead><tbody><tr><td>7871</td><td>162.5<br>± 2.1</td><td>81.1<br>± 4.1</td><td>132.2<br>± 3.8</td><td>0.15<br>± 0.061</td><td>2031.69<br>± 5.2</td><td>214.33<br>± 11.9</td><td>1.680<br>± 0.093</td><td>0.550<br>± 0.022</td><td>0.02860</td><td>0.37369</td><td>0.53542</td><td>-0.10889</td></tr><tr><td>7982</td><td>44.4<br>± 5.7</td><td>112.4<br>± 12.5</td><td>105.2<br>± 6.3</td><td>0.753<br>± 0.15</td><td>1902.11<br>± 3.6</td><td>128.53<br>± 8.7</td><td>2.801<br>± 0.19</td><td>1.115<br>± 0.066</td><td>-0.11417</td><td>-0.49014</td><td>-0.81449</td><td>-0.64175</td></tr><tr><td>8128</td><td>178.2<br>± 3.9</td><td>26.9<br>± 18.1</td><td>62.2<br>± 6.9</td><td>0.889<br>± 0.04</td><td>2010.19<br>± 0.8</td><td>341<br>± 53</td><td>1.054<br>± 0.28</td><td>2.300<br>± 0.036</td><td>-2.06537</td><td>-0.42065</td><td>1.01004</td><td>-0.98884</td></tr></tbody></table>

in columns 2, 4 and 6 and the position angles $\theta$ in columns 3, 5 and 7.

We present some physical parameters derived for those systems from our orbital elements in Table 7. For each object whose name is given in column 1 we report its apparent, combined visual magnitude in column 2, its spectral type in column 3, the *Hipparchos* parallax $\pi_{HIP}$ in column 4, the apparent angular extent of the semi major axis *a* in arcseconds in column 5 (from Table 2), the linear size of *a* in ‘au’ in column 6 and the total mass of the system $M_{total}$ in column 7. Both the linear size of *a* and $M_{total}$ were computed from our orbital elements and using the *Hipparchos* parallax.

<table><caption>**Table 3.** ADS 7871: *O* − *C* residuals of our new orbit (after 1990). The symbol *P* indicates PISCO measurements.</caption><thead><tr><th>Epoch</th><th>Δρ (O − C)<br>(arcsec)</th><th>Δθ (O − C)<br>(°)</th><th>Observer</th></tr></thead><tbody><tr><td>1991.250</td><td>0.023</td><td>−1.0</td><td>HIP</td></tr><tr><td>1991.840</td><td>0.031</td><td>0.6</td><td>TYC</td></tr><tr><td>1993.266</td><td>0.024</td><td>−3.9</td><td>Lin</td></tr><tr><td>1993.266</td><td>—</td><td>−7.3</td><td>Lcr</td></tr><tr><td>1995.910</td><td>0.042</td><td>−0.7</td><td>Alz</td></tr><tr><td>1997.071</td><td>0.016<sup>P</sup></td><td>0.5<sup>P</sup></td><td>Ari</td></tr><tr><td>1997.300</td><td>−0.064</td><td>−0.0</td><td>Alz</td></tr><tr><td>1999.300</td><td>—</td><td>1.0</td><td>Alz</td></tr><tr><td>2000.190</td><td>−0.012</td><td>1.8</td><td>Alz</td></tr><tr><td>2002.300</td><td>0.008</td><td>3.3</td><td>Alz</td></tr><tr><td>2005.327</td><td>0.028<sup>P</sup></td><td>0.6<sup>P</sup></td><td>Sca</td></tr><tr><td>2006.194</td><td>0.044</td><td>0.1</td><td>Msn</td></tr><tr><td>2006.360</td><td>0.046<sup>P</sup></td><td>1.9<sup>P</sup></td><td>Pru</td></tr><tr><td>2007.288</td><td>0.033<sup>P</sup></td><td>−1.3<sup>P</sup></td><td>This paper</td></tr></tbody></table>

<table><caption>**Table 4.** ADS 7982: *O* − *C* residuals of our new orbit (after 1990). The symbol *P* indicates PISCO measurements.</caption><thead><tr><th>Epoch</th><th>Δρ (O − C)<br>(arcsec)</th><th>Δθ (O − C)<br>(°)</th><th>Observer</th></tr></thead><tbody><tr><td>1990.216</td><td>−0.109</td><td>−1.5</td><td>Pop</td></tr><tr><td>1990.216</td><td>—</td><td>3.3</td><td>Zul</td></tr><tr><td>1990.270</td><td>—</td><td>2.3</td><td>Hei</td></tr><tr><td>1991.250</td><td>−0.036</td><td>−1.6</td><td>HIP</td></tr><tr><td>1991.480</td><td>−0.045</td><td>−0.6</td><td>TYC</td></tr><tr><td>1995.330</td><td>−0.127</td><td>−1.5</td><td>Hei</td></tr><tr><td>1996.127</td><td>−0.034</td><td>−1.1</td><td>Hor</td></tr><tr><td>1999.330</td><td>0.042<sup>P</sup></td><td>−1.7</td><td>Alz</td></tr><tr><td>2006.308</td><td>0.030<sup>P</sup></td><td>−0.2<sup>P</sup></td><td>Pru</td></tr><tr><td>2007.323</td><td>0.049<sup>P</sup></td><td>1.0<sup>P</sup></td><td>This paper</td></tr></tbody></table>

<table><caption>**Table 5.** ADS 8128: *O* − *C* residuals of our new orbit (after 2000). The symbol *P* indicates PISCO measurements.</caption><thead><tr><th>Epoch</th><th>Δρ (O − C)<br>(arcsec)</th><th>Δθ (O − C)<br>(°)</th><th>Observer</th></tr></thead><tbody><tr><td>2000.119</td><td>−0.042</td><td>0.6</td><td>WSI</td></tr><tr><td>2000.250</td><td>0.014</td><td>−0.9</td><td>Alz</td></tr><tr><td>2001.310</td><td>−0.003</td><td>−3.5</td><td>Alz</td></tr><tr><td>2002.164</td><td>0.008</td><td>−0.1</td><td>WSI</td></tr><tr><td>2002.250</td><td>0.031</td><td>−2.0</td><td>Alz</td></tr><tr><td>2003.233</td><td>−0.058</td><td>5.6</td><td>WSI</td></tr><tr><td>2003.280</td><td>0.024</td><td>−0.4</td><td>Alz</td></tr><tr><td>2003.316</td><td>−0.015</td><td>2.8</td><td>WSI</td></tr><tr><td>2003.382</td><td>−0.023</td><td>0.8</td><td>WSI</td></tr><tr><td>2003.479</td><td>−0.001</td><td>−1.1</td><td>WSI</td></tr><tr><td>2004.199</td><td>−0.001</td><td>−1.4</td><td>Hrt</td></tr><tr><td>2004.228</td><td>0.027</td><td>−4.4</td><td>WSI</td></tr><tr><td>2004.270</td><td>−0.022</td><td>3.8</td><td>Alz</td></tr><tr><td>2005.280</td><td>−0.025</td><td>−2.4</td><td>Alz</td></tr><tr><td>2005.307</td><td>0.005</td><td>−2.0</td><td>WSI</td></tr><tr><td>2005.402</td><td>−0.014</td><td>−2.4</td><td>WSI</td></tr><tr><td>2006.300</td><td>−0.007</td><td>−2.3</td><td>Alz</td></tr><tr><td>2007.277</td><td>−0.007<sup>P</sup></td><td>0.3<sup>P</sup></td><td>This paper</td></tr><tr><td>2007.288</td><td>−0.011<sup>P</sup></td><td>−0.1<sup>P</sup></td><td>This paper</td></tr><tr><td>2007.290</td><td>0.005</td><td>3.0</td><td>Alz</td></tr><tr><td>2008.251</td><td>0.018</td><td>−0.9</td><td>Gili</td></tr></tbody></table>

## 4.1 New orbit of ADS 7871

ADS 7871, STT 224 (HIP 52187): this couple was discovered with the 40-cm refractor of Pulkova Observatory by Otto Struve between 1841 August and 1842 December, and noted (Struve 1843) that the pair was ‘oblonga’ (elongated). The first measurement of STT 224 was made in 1843 March 16 by J. H. Madler in Dorpat, with the 25-cm refractor used by F. G. W. Struve for his 1825–1827 large binary survey (Madler 1845). This couple probably belongs to the Hyades Group (Eggen 1960). A few orbits of STT 224 have been computed, like that of Ekenberg (1945) which is reported in Worley & Heintz (1983)’s catalogue, or the most recent, from Heintz (1984), which begins to show large residuals with the latest observations (see Fig. 3).

From the 163 measurements obtained since 1843, we derived the new orbital elements reported in Table 2. The standard deviations of the residuals are 0.09 arcsec and 6.4 for $\rho$ and $\theta$, respectively. This scatter is explained by the large magnitude difference between the two companions ($\Delta m_V = 1.14$), which makes the measurements difficult to perform.

The total mass of the system derived from our orbit is 3.6 ± 2.1 $M_\odot$ (see Table 7), which is consistent with the value expected for a system of two main sequence stars with this spectral type (F5).
<figure><img src="image_5.png" /></figure>

<figure><img src="image_6.png" /></figure>

<figure><img src="image_7.png" /><figcaption>Figure 4. New orbits of ADS 7871 (a), ADS 7982 (b) and ADS 8128 (c).</figcaption></figure>

<table><caption>Table 6. New ephemerides of ADS 7871, 7982 and 8128.</caption><thead><tr><th rowspan="2">Epoch</th><th colspan="2">ADS 7871</th><th colspan="2">ADS 7982</th><th colspan="2">ADS 8128</th></tr><tr><th>ρ<br>(arcsec)</th><th>θ<br>(°)</th><th>ρ<br>(arcsec)</th><th>θ<br>(°)</th><th>ρ<br>(arcsec)</th><th>θ<br>(°)</th></tr></thead><tbody><tr><td>2009.0</td><td>0.454</td><td>140.8</td><td>1.092</td><td>54.5</td><td>0.283</td><td>170.7</td></tr><tr><td>2010.0</td><td>0.448</td><td>139.1</td><td>1.078</td><td>54.0</td><td>0.245</td><td>187.5</td></tr><tr><td>2011.0</td><td>0.441</td><td>137.4</td><td>1.063</td><td>53.5</td><td>0.183</td><td>214.1</td></tr><tr><td>2012.0</td><td>0.434</td><td>135.7</td><td>1.045</td><td>52.9</td><td>0.156</td><td>259.5</td></tr><tr><td>2013.0</td><td>0.428</td><td>133.9</td><td>1.026</td><td>52.4</td><td>0.211</td><td>298.0</td></tr><tr><td>2014.0</td><td>0.421</td><td>132.0</td><td>1.005</td><td>51.8</td><td>0.304</td><td>316.7</td></tr><tr><td>2015.0</td><td>0.414</td><td>130.0</td><td>0.981</td><td>51.2</td><td>0.403</td><td>326.4</td></tr><tr><td>2016.0</td><td>0.406</td><td>128.0</td><td>0.955</td><td>50.5</td><td>0.501</td><td>332.3</td></tr><tr><td>2017.0</td><td>0.399</td><td>126.0</td><td>0.926</td><td>49.8</td><td>0.594</td><td>336.3</td></tr><tr><td>2018.0</td><td>0.392</td><td>123.8</td><td>0.894</td><td>49.1</td><td>0.683</td><td>339.2</td></tr></tbody></table>

<table><caption>Table 7. Physical parameters (a and $M_{\text{total}}$) derived from the new orbital elements.</caption><thead><tr><th>Name</th><th>m<sub>V</sub></th><th>Spec. type</th><th>π<sub>HIP</sub><br>(mas)</th><th>a<br>(arcsec)</th><th>M<sub>total</sub><br>(au)</th></tr></thead><tbody><tr><td>ADS 7871</td><td>7.50</td><td>F5</td><td>10.04<br>± 1.84</td><td>0.550<br>± 0.022</td><td>54.8<br>± 10.3</td></tr><tr><td>ADS 7982</td><td>5.93</td><td>F3 V</td><td>22.85<br>± 1.13</td><td>1.115<br>± 0.066</td><td>48.8<br>± 3.8</td></tr><tr><td>ADS 8128</td><td>6.95</td><td>F9 V</td><td>31.17<br>± 1.55</td><td>2.30<br>± 0.04</td><td>73.8<br>± 3.8</td></tr></tbody></table>

The dynamical parallax of $\pi_{\text{dyn}} = 11$ mas is also in good agreement with the *Hipparcos* measurement.

## 4.2 New orbit of ADS 7982

ADS 7982, BU 1076, 55 Leo (HIP 53423): this couple was discovered by S. W. Burnham in 1889 April, with the 91-cm refractor of Lick Observatory (Burnham, 1890). The two components have a very large magnitude difference ($\Delta m_V = 3.04$ in OC6), which makes them difficult to measure.

To our knowledge, only two orbits were computed for ADS 7982, by Baize (1957) and Morel (1970). Those orbits could not take advantage of the numerous measurements obtained by speckle interferometry and are not longer representative of the observations. All the measurements made after 1999 were obtained with PISCO.

The orbital elements reported in Table 2 were derived from the 51 available measurements obtained since 1889. Convergence was easy to achieve and we are thus able to provide the uncertainties on the orbital elements. As usual for close binaries with a large magnitude difference, the measurements have a large scatter. The mean standard deviation of the residuals is 6.52 in $\theta$ and 0.15 arcsec in $\rho$.

Following Morel, we have chosen the geometrical elements according to the convention of visual binary observers (i.e. ascending node in the range $[0^\circ, 180^\circ]$). But the WDS Index Catalogue Notes report that the radial velocity measurements of the primary obtained in 1919–1930 ‘would fit the visual motion with an ascending node in the third quadrant’.

The spectral type of this system is F2 III according to the SIMBAD (Set of Identifications, Measurements and Bibliography for Astronomical Data) data base, that follows the determination of Malaroda (1975). In fact, two other classifications have been made for this object, as F3V
<figure><img src="image_8.png" /><figcaption>**Figure 5.** New orbit of ADS 8128 (solid line) compared to data points (crosses): plot of angular separation (top) and position angle (bottom).</figcaption></figure>

(Cowley & Bidelman 1979) and F4V (Abt 1981). From the *Hipparcos* parallax and the apparent visual magnitude, we find $M_V \approx 2.72$ for the system (when neglecting the interstellar absorption, since the distance is only 44 pc). This value can be attributed to the primary only, since the companion has a negligible contribution to the total luminosity (since $\Delta m_V \approx 3$). The theoretical values (e.g. Schmidt-Kaler 1982) are $M_V \approx 3.0$ for F2 V stars and $M_V \approx 1.7$ for F2 III stars. Hence, the classification as F3 V is more likely than F2 III. The systemic mass that we obtain, with a reasonable uncertainty, is in excess for stars of this spectral type. From 23 spectroscopic measurements made on a time interval larger than 9 yr, Abt, Sanwal & Levy (1980) did not detect any significant variation of its radial velocity.

Although the period can be considered as well determined, our orbit is not yet definitive. Clearly, more observations are needed to improve this orbit.

## 4.3 New orbit of ADS 8128

ADS 8128, STF 1527 (HIP 55254): this couple was measured for the first time in 1822, by F. G. W. Struve in Dorpat with a 10-cm refractor and a filar micrometer built by J. Fraunhofer. It has been regularly observed since and 250 measurements are now available. The measurements made in the XIXth century have a rather large scatter, especially in the angular separation.

The first orbit was computed by Hopmann (1960b), who proposed a long period orbit. The next measurements suggested a shorter period. The last orbit from Mason et al. (2006) is in complete disagreement with our recent measurements and those obtained by other observers (see Section 3.4). This is not surprising: with an

eccentricity of $e = 0.993$, this orbit looks unlikely. The residuals are smaller for the previous orbit, computed by Mason et al. (2004b), where $e = 0.86$, but are still very large (see Table 1).

Our new orbital elements reported in Table 2 fit much better the observations (see Fig. 5), with mean residuals of $0.03 \pm 0.11$ arcsec and $0.04 \pm 0.10$ for $\rho$ and $\theta$, respectively. Although this orbit is still preliminary (grade 3–4) since only part of it has been monitored yet, we do not think it will change much in the future. A first confirmation of its validity was given by the speckle observation made by Gili on 2008.251 with the 76 cm-refractor of Nice Observatory, that he kindly provided us after the submission of this paper (see Table 5).

The spectral type is F9 V according to Harlan & Taylor (1970). The total mass, $M_{\text{total}} = 3.4$ M$_{\odot}$, is slightly in excess for a system of type F9 V, but the dynamical parallax of 39.3 mas is in fair agreement with *Hipparcos* measurement of 31.17 mas (see Table 7).

## 5 CONCLUSION

In the first semester of 2007, we obtained 226 new measurements of 214 visual binaries with PISCO in Merate, with an average accuracy of $0.013$ arcsec for the angular separation and $0.7$ for the position angles. The total number of observations made since 2004 now reaches 1312. This work is thus a good contribution to the continuing monitoring of long period visual binary systems, which is important for refining systemic stellar masses.

We have used the measurements reported here to revise the orbits of ADS 4371, 4376, 7730 (Scardia et al. 2008c) and those of ADS 7871, 7982 and 8128, whose elements are presented in this paper. ADS 8128 will be particularly interesting to observe for the next years, because the companion is close to periastron (see Fig. 4c), the most critical part of the orbit.

## ACKNOWLEDGMENTS

We thank the members of the US Naval Observatory, Washington DC, for kindly sending on request some lists of measurements of visual binaries. We are indebted to René Gili for sending us his measurement of ADS 8128 with the 76-cm Nice Observatory refractor, prior to publication.

This work has made use of the ‘Fourth Catalogue of Interferometric Measurements of Binary Stars’ (http://ad.usno.navy.mil/wds/int4), the ‘Sixth Catalogue of Orbits of Visual Binary Stars’ (http://ad.usno.navy.mil/wds/orb6), the Washington Double Star Catalogue maintained at the US Naval Observatory (http://ad.usno.navy.mil/wds/wds) and the SIMBAD data base (http://simbad.u-strasbg.fr/simbad) operated by the *Centre de Données Astronomiques de Strasbourg* (France).

## REFERENCES

* Abt H., 1981, ApJS, 45, 437

* Abt H., Sanwal N. B., Levy S. G., 1980, ApJS, 43, 549

* Aitken R. G., 1932, New General Catalogue of Double Stars. Carnegie Institute, Washington

* Alzner A., 1998, A&AS, 132, 253

* Alzner A., 2000, IAU Commission 26, Inf. Circ. 141

* Alzner A., 2003, IAU Commission 26, Inf. Circ. 149

* Alzner A., 2008, Webb Soc. Double Star Section Circ., 16, 7

* Aristidi E. et al., 1999, A&AS, 134, 545

* Aristidi E., Carbillet M., Lyon J.-F., Aime C., 1997, A&AS, 125, 139

* Baize P., 1957, J. Obs., 40, 174

* Barnaby D., Spillar E., Christou J. C., Drummond J. D., 2000, AJ, 119, 378

* Brendley M., Mason B. D., 2006, IAU Commission 26, Inf. Circ. 160
Burnham S. W., 1890, Astron. Nachr., 123, 1

Cole W. A., Fekel F. C., Hartkopf W. I., McAlister H. A., Tomkin J., 1992, AJ, 103, 1357

Couteau P., 1999, Cat. de 2700 étoiles doubles 'COU'. Obs. de la Côte d'Azur, 3rd edn. Obs. de la Côte d'Azur, Nice

Cowley A. P., Bidelman W. P., 1979, PASP, 91, 83

Cvetkovic Z., Novakovic B., 2006, Serbian AJ, 173, 73

Cvetkovic Z., Novakovic B., Todorovic N., 2008, New Astron., 13, 125

Docobo J. A., Costa J. M., 1985, IAU Commission 26, Inf. Circ. 96

Docobo J. A., Costa J. M., 1990, IAU Commission 26, Inf. Circ. 111

Docobo J. A., Ling J. F., 1999, ApJS, 120, 41

Docobo J. A., Ling J. F., 2001, IAU Commission 26, Inf. Circ. 145

Docobo J. A., Ling J. F., 2007a, AJ, 133, 1209

Docobo J. A., Ling J. F., 2007b, IAU Commission 26, Inf. Circ. 163

Docobo J. A., Ling J. F., Prieto C., 1994, ApJS, 91, 793

Eggen O. J., 1960, MNRAS, 120, 540

Ekenberg B., 1945, Lund Meddl., Ser., II, No. 116

Harlan E. A., Taylor D. C., 1970, AJ, 75, 507

Hartkopf W. I., 2000, IAU Commission 26, Inf. Circ. 141

Hartkopf W. I., Mason B. D., 2000, IAU Commission 26, Inf. Circ. 142

Hartkopf W. I., Mason B. D., 2001, IAU Commission 26, Inf. Circ. 145

Hartkopf W. I., Mason B. D., 2008, Sixth Catalogue of Orbits of Visual Binary Stars, http://ad.usno.navy.mil/wds/orb6.html (OC6)

Hartkopf W. I., McAlister H. A., Franz O. G., 1989, AJ, 98, 1014

Hartkopf W. I., Mason B. D., McAlister H. A., 1996, AJ, 111, 370

Hartkopf W. I., Mason B. D., Rafferty T., 2008a, AJ, 135, 1334

Hartkopf W. I., Mason B. D., Wycoff G. L., McAlister H. A., 2008b, Fourth Catalogue of Interferometric Measurements of Binary Stars, http://ad.usno.navy.mil/wds/int4.html (IC4)

Heintz W. D., 1975, ApJS, 29, 331

Heintz W. D., 1982, A&AS, 47, 569

Heintz W. D., 1984, A&AS, 56, 5

Heintz W. D., 1991, A&AS, 90, 311

Heintz W. D., 1993, A&AS, 98, 209

Heintz W. D., 1996a, AJ, 111, 408

Heintz W. D., 1996b, AJ, 111, 412

Heintz W. D., 1997, ApJS, 111, 335

Heintz W. D., 1998, ApJS, 117, 587

Hellerich J., 1925, Astron. Nachr., 223, 335

Høg E. et al., 2000, A&A, 357, 367

Hopmann J., 1960a, Mitt. Univ. Sternw. Wien, 10, 155

Hopmann J., 1960b, Mitt. Univ. Sternw. Wien, 10, 194

Hopmann J., 1970, Astron. Mitt. Wien, 5

Jasinta D. M. D., 1996, A&AS, 118, 381

Kowalsky M., 1873, Procès-verbaux de l'Université Imperiale de Kasan

Madler J. H., 1845, Dorpat Beobachtungen, 11, 56

Malaroda S., 1975, AJ, 80, 637

Mason B. D., Hartkopf W. I., 1998, IAU Commission 26, Inf. Circ. 134

Mason B. D., Hartkopf W. I., 2001, IAU Commission 26, Inf. Circ. 144

Mason B. D., McAlister H. A., Hartkopf W. I., Shara M. M., 1995, AJ, 109, 332

Mason B. D., Douglass G. G., Hartkopf W. I., 1999, AJ, 117, 1023

Mason B. D., Hartkopf W. I., Wycoff G. L., Pascu D., Urban S. E., Hall D. M., 2004a, AJ, 127, 539

Mason B. D., Hartkopf W. I., Wycoff G. L., Rafferty T. J., Urban S. E., Flagg L., 2004b, AJ, 128, 3012

Mason B. D., Hartkopf W. I., Wycoff G. L., Holdenried E. R., 2006, AJ, 132, 2219

Morel J. P., 1970, A&AS, 1, 115

Novakovic B., 2006, IAU Commission 26, Inf. Circ. 158

Novakovic B., 2007, Chin. J. Astron. Astrophys., 7, 415

Olevic D., Jovanovic P., 2001, Serbian AJ, 163, 5

Olevic D., Popovic G. M., Zulevic D. J., Catovic Z., 1993, Bull. Obs. Astron. Belgrade, 148, 49

Pavlovic R., Todorovic N., 2005, Serbian AJ, 170, 73

Prieur J.-L., Koechlin L., André C., Gallou G., Lucuix C., 1998, Exp. Astron., 8, 297

Prieur J. L., Scardia M., Pansecchi L., Argyle R. W., Sala M., Ghigo M., Koechlin L., Aristidi E., 2008, MNRAS, 387, 772 (Paper V)

Scardia M., 1983, Astron. Nachr., 304, 257

Scardia M., 1984, IAU Commission 26, Inf. Circ. 92

Scardia M., 1985, IAU Commission 26, Inf. Circ. 96

Scardia M., Prieur J.-L., Koechlin L., Aristidi E., 2001, Astron. Nachr., 322, 161

Scardia M., Prieur J.-L., Koechlin L., Aristidi E., 2002a, IAU Commission 26, Inf. Circ. 146

Scardia M., Prieur J.-L., Koechlin L., Aristidi E., 2002b, IAU Commission 26, Inf. Circ. 147

Scardia M., Prieur J.-L., Sala M., Ghigo M., Koechlin L., Aristidi E., Mazzoleni F., 2005, MNRAS, 357, 1255 (with erratum in MNRAS, 362, 1120) (Paper I)

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., Sala M., Ghigo M., Koechlin L., Aristidi E., 2006, MNRAS, 367, 1170 (Paper II)

Scardia M. et al., 2007a, MNRAS, 374, 965 (Paper III)

Scardia M., Argyle R. W., Prieur J.-L., Pansecchi L., Basso S., Law N. M., Mackay C. D., 2007b, Astron. Nachr., 328, 2, 146

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., 2007c, IAU Commission 26, Inf. Circ. 162

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., 2008a, IAU Commission 26, Inf. Circ. 165

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., 2008b, IAU Commission 26, Inf. Circ. 166

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., 2008c, Astron. Nachr., 329, 4, 379

Scardia M. et al., 2008d, Astron. Nachr., 329, 1, 54 (Paper IV)

Scardia M., Prieur J.-L., Pansecchi L., Argyle R. W., Sala M., 2009, Astron. Nachr., 330, 55 (Paper VI)

Schmidt-Kaler Th., 1982, in Aller L. H., et al., eds, Landolt-Börnstein, Numerical Data and Functional Relationships in Science and Technology – New Series, 2-B. Springer-Verlag, Berlin, p. 1

Seymour D., Hartkopf W., 1999, IAU Commission 26, Inf. Circ. 139

Seymour D., Mason B., 1999, IAU Commission 26, Inf. Circ. 139

Seymour D., Mason B. D., Hartkopf W. I., Wycoff G., 2002, AJ, 123, 1023

Söderhjelm S., 1999, A&A, 341, 121

Starikova G. A., 1983, SvAL 9, 189 (Pisma Astron. Zhur. 9, 358)

Starikova G. A., 1985, Trud. Astron. Inst. Sternberg, 57, 243

Struve F. G. W., 1843, Catalogue de 514 étoiles doubles et multiples. Académie Impériale des Sciences, St. Petersburg

van Dessel E., 1976, A&AS, 26, 415

Worley C. E., Heintz W. D., 1983, US Naval Obs Publ, Vol. XXIV, (VII), US Naval Obs., Washington, DC

Zaera J. A., 1984, IAU Commission 26, Inf. Circ. 93

Zulevic D. J., 1981, IAU Commission 26, Inf. Circ. 85

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