仙王座 W

仙王座 W是位於仙王座這個星座的一顆光譜聯星和變星。他被認為是仙王座 OB1星協的成員，距離我們大約8,000光年。 仙王座W是在1865年被報告為變星，它的變光範圍在7.3至8.3等。它在1903年出版的波恩星表篇目為BD+57°2568，而在HD星表的序號是HD 214369。 在1925年，仙王座 W被列入Be星的表單中。它的光譜類型被認定為低溫的Mep 。依據1949年的頻譜，它被歸類為K0ep Ia，但也被認為有一顆小的高溫伴星，並加上不尋常的紅外過量。研究來自伴星的紫外線光譜吸收線，它的光譜被歸類為B0-1。 仙王座 W的系統包括一顆K型超巨星與一顆光譜類型為早期B型的非超巨星伴星。這顆恆星有不尋常的發射線，包括由含有塵埃和電離氣體的星周包層產生的許可和禁制的FeII線。使用斑點干涉解析出兩顆成員相距0.262"。已提出可能的軌道週期是2,090日。 仙王座 W的亮度變化從7等至9等。變星總表將它列為半規則變星，試圖找出週期但是只顯示隨機的光度變化。 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.  Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.  Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. Astronomy and Astrophysics. 2005, 430: 165. Bibcode:2005A&A...430..165F. arXiv:astro-ph/0409579 . doi:10.1051/0004-6361:20041272.  >Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. Astronomy and Astrophysics. 2005, 430: 165. Bibcode:2005A&A...430..165F. arXiv:astro-ph/0409579 . doi:10.1051/0004-6361:20041272.  Wallerstein, George. On the Infrared Excess of W Cephei and Similar Stars. Astrophysical Journal. 1971, 166: 725. Bibcode:1971ApJ...166..725W. doi:10.1086/150996.  Stickland, David J. IUE and stars with composite spectra. In ESA. 1988, 281. Bibcode:1988ESASP.281b..27S.  Garmany, C. D.; Stencel, R. E. Galactic OB associations in the northern Milky Way Galaxy. I - Longitudes 55 deg to 150 deg. Astronomy and Astrophysics Supplement Series. 1992, 94: 211. Bibcode:1992A&AS...94..211G.  Polyakova, T. A. Variations in the brightness and polarization of W Cep. Astrophysics. 2006, 49 (2): 164. Bibcode:2006Ap.....49..164P. doi:10.1007/s10511-006-0017-z.  Chandler, S. C. Third catalogue of variable stars. Astronomical Journal. 1896, 16: 145. Bibcode:1896AJ.....16..145C. doi:10.1086/102484.  Merrill, P. W.; Humason, M. L.; Burwell, C. G. Discovery and Observations of Stars of Class Be. Astrophysical Journal. 1925, 61: 389. Bibcode:1925ApJ....61..389M. doi:10.1086/142899.  Bidelman, William P. Catalogue and Bibliography of Emission-Line Stars of Types Later than B. Astrophysical Journal Supplement. 1954, 1: 175. Bibcode:1954ApJS....1..175B. doi:10.1086/190007.  Woolf, N. J. Infrared emission from unusual binary stars. Astrophysical Journal. 1973, 185: 229. Bibcode:1973ApJ...185..229W. doi:10.1086/152411.  Wing, R. F.; Carpenter, K. G. Notes on the early-type components of W Cep, O Cet, CH Cyg, AR Mon, and BL Tel. In NASA. Goddard Space Flight Center the Universe at Ultraviolet Wavelengths: the First Two Yrs. of Intern. Ultraviolet Explorer p 341-347 (SEE N81-25893 16-90). 1981, 2171. Bibcode:1981NASCP2171..341W.  Prieur, J. L.; Aristidi, E.; Lopez, B.; Scardia, M.; Mignard, F.; Carbillet, M. High Angular Resolution Observations of Late-Type Stars. The Astrophysical Journal Supplement Series. 2002, 139: 249. Bibcode:2002ApJS..139..249P. doi:10.1086/338029.  Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. Variability in red supergiant stars: Pulsations, long secondary periods and convection noise. Monthly Notices of the Royal Astronomical Society. 2006, 372 (4): 1721. Bibcode:2006MNRAS.372.1721K. arXiv:astro-ph/0608438 . doi:10.1111/j.1365-2966.2006.10973.x.  Percy, John R.; Sato, Hiromitsu. Long Secondary Periods in Pulsating Red Supergiant Stars. Journal of the Royal Astronomical Society of Canada. 2009, 103: 11. Bibcode:2009JRASC.103...11P.  AAVSO chart of comparison stars for W Cephei（页面存档备份，存于互联网档案馆） British Astronomical Association VSS light curves（页面存档备份，存于互联网档案馆）