HD 83446
Star in the constellation Vela
This article is about M Velorum. For m Velorum, see
HD 85622 .
HD 83446 is a probable astrometric binary [ 10] star system in the constellation Vela . It is visible to the naked eye with an apparent visual magnitude of 4.34.[ 2] Based upon an annual parallax shift of 30.5 mas ,[ 1] it is located 107.1 light years from the Sun. The system is moving further away with a heliocentric radial velocity of +18 km/s.[ 6]
The visible component is an A-type main-sequence star with a stellar classification of A7 V.[ 4] Observations with the BRITE constellation led to this star's identification as a Delta Scuti variable with pulsation frequencies of 31.0806 and 34.2098 cycles per day, corresponding to periods of 46.3 and 42.1 minutes, respectively.[ 5] It has a high rate of spin with a projected rotational velocity of 155 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius.[ 8] The star is roughly 453[ 7] million years old with 1.8[ 7] times the mass of the Sun . It is radiating 16[ 2] times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.[ 7]
References
^ a b c d e f 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 .
^ a b c d e f 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.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120, arXiv :1201.2052 , Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 .
^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal , 132 (1): 161–170, arXiv :astro-ph/0603770 , Bibcode :2006AJ....132..161G , doi :10.1086/504637 , S2CID 119476992 .
^ a b Zwintz, K. (September 2017), "A BRITE view on δ Scuti and γ Doradus stars", in Zwintz, Konnstanze; Poretti, Ennio (eds.), Second BRITE-Constellation Science Conference: Small satellites—big science, Proceedings of the Polish Astronomical Society volume 5, held 22-26 August, 2016 in Innsbruck, Austria , vol. 5, Bartycka 18, 00-716 Warsaw, Poland: Polish Astronomical Society, pp. 228–235, arXiv :1611.04917 , Bibcode :2017sbcs.conf..228Z {{citation }}
: CS1 maint: location (link )
^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14, arXiv :1208.3048 , Bibcode :2012A&A...546A..61D , doi :10.1051/0004-6361/201219219 , S2CID 59451347 , A61.
^ a b c d e f g Gullikson, Kevin; et al. (2016), "The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars", The Astronomical Journal , 152 (2): 40, arXiv :1604.06456 , Bibcode :2016AJ....152...40G , doi :10.3847/0004-6256/152/2/40 , S2CID 119179065 .
^ a b Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review , 20 (1): 51, arXiv :1204.2572 , Bibcode :2012A&ARv..20...51V , doi :10.1007/s00159-012-0051-2 , S2CID 119273474 .
^ "HD 83446" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-08-08 .
^ 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, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .