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Tags anthias New Species sacura Alpha Sextantis - Wikipedia
Die ligging van Alpha Sextantis (in die rooi sirkel).
Spektraaltipe A0 III
Regte klimming 10h 07m 56.29556s
Deklinasie -0° 22′ 17.8621″
Skynmagnitude (m) 4,49
Absolute magnitude (M) −0,29±0,21
Massa (M☉) 2,96±0,12
Radius (R☉) 4,5
Ligsterkte (L☉) 120
Ouderdom (jaar) 295
Temperatuur (K) 9 984
Afstand (ligjaar) 280
Rotasiespoed (km/s) 21
Metaalinhoud [Fe/H] −0,03±0,18
15 Sextantis, BD+00° 2615, FK5 2814, HD 87887, HIP 49641, HR 3981, SAO 137366
Alpha Sextantis (afgekort as α Sex) is die helderste ster in die sterrebeeld Sekstant (Sextans). Met ’n skynbare magnitude van 4,49 is dit met die blote oog sigbaar. Volgens parallaksmetings is dit sowat 280 ligjare van die Son af.
Dit word as ’n "ewenaarster" beskou omdat dit minder ’n kwartgraad suid van die hemelewenaar lê. In 1900 was dit 7 boogminute noord van die ewenaar. Vanweë ’n verskuiwing van die Aarde se draaias het dit in Desember 1923 na die Suidelike Halfrond geskuif.
Alpha Sextantis is ’n geëvolueerde A-tipe reusester met ’n sterreklassifikasie van A0 III. Sy massa is sowat drie keer en sy radius sowat 4,5 keer dié van die Son. Sy hoeveelheid metale (elemente swaarder as waterstof en helium) is soortgelyk aan die Son s'n. Dit straal omtrent 120 soveel ligsterkte as die Son uit met sy effektiewe temperatuur van 9 984 K. Alpha Sextantis is sowat 295 miljoen jaar oud.
↑ 1,0 1,1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
↑ 2,0 2,1 2,2 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
↑ 3,0 3,1 3,2 3,3 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (ongepubliseer), SIMBAD, Bibcode: 1986EgUBV........0M.
↑ 4,0 4,1 4,2 Gerbaldi, M. et al. (Junie 1999), "Search for reference A0 dwarf stars: Masses and luminosities revisited with HIPPARCOS parallaxes", Astronomy and Astrophysics Supplement 137: 273–292, doi:10.1051/aas:1999248, Bibcode: 1999A&AS..137..273G.
↑ 5,0 5,1 Pasinetti Fracassini, L. E. et al. (Februarie 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
↑ 6,0 6,1 6,2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
↑ 7,0 7,1 Su, K. Y. L. et al. (Desember 2006), "Debris Disk Evolution around A Stars", The Astrophysical Journal 653 (1): 675–689, doi:10.1086/508649, Bibcode: 2006ApJ...653..675S.
↑ Royer, F. et al. (Oktober 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
↑ 9,0 9,1 Pintado, O. I.; Adelman, S. J. (Augustus 2003), "Elemental abundance analyses with the EBASIM spectrograph of the 2.1-m CASLEO Observatory Telescope. I. The late B and early A stars vec xi Octantis, alpha Sextantis, and 68 Tauri", Astronomy and Astrophysics 406: 987–994, doi:10.1051/0004-6361:20030813, Bibcode: 2003A&A...406..987P.
↑ "alf Sex". Simbad. Centre de données astronomiques de Strasbourg. Besoek op 2016-12-12.
↑ "Sextans (abbr. Sex, gen. Sextantis)", The Internet Encyclopedia of Science, http://www.daviddarling.info/encyclopedia/S/Sex.html, besoek op 2016-12-12.
↑ Kaler, James B., "Alpha Sextantis", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/alphasext.html, besoek op 2016-12-12.
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Die bladsy is laas op 11 Julie 2019 om 10:27 bygewerk.