Star in the constellation Vulpecula
20 Vulpeculae is single star located around 1,170 light years away in the northern constellation of Vulpecula . It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.91. The object is moving closer to the Earth with a heliocentric radial velocity of −22 km/s.
This is a Be star with a stellar classification of B7 Ve. It is spinning rapidly with a projected rotational velocity of 236 km/s (compared to a critical velocity of 332 km/s) and has an estimated polar inclination of 71.1°. The star has four times the mass of the Sun and is radiating around 460 times the Sun's luminosity from its photosphere at an effective temperature of 12,050 K.
References
^ Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 .Gaia DR2 record for this source at VizieR .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics , 537 : A120, arXiv :1201.2052 , Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 .
^ Antoniou, A.; et al. (2011), "Studying the UV mg II Resonance Lines in 20 Be Stars", Baltic Astronomy , 20 (4): 572–575, Bibcode :2011BaltA..20..572A , doi :10.1515/astro-2017-0338 .
^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (Third ed.): 521–524, arXiv :astro-ph/0012289 , Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 .
Chauville, J.; et al. (November 2001), "High and intermediate-resolution spectroscopy of Be stars 4481 lines" (PDF), Astronomy and Astrophysics , 378 : 861–882, Bibcode :2001A&A...378..861C , doi :10.1051/0004-6361:20011202 .
^ "20 Vulpeculae" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-03-16.
Frémat, Y.; Zorec, J.; Hubert, A.-M.; Floquet, M. (2005), "Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars", Astronomy and Astrophysics , 440 (1): 305, arXiv :astro-ph/0503381 , Bibcode :2005A&A...440..305F , doi :10.1051/0004-6361:20042229 , S2CID 19016751 .
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