HD 90264
Binary star in the constellation Carina
This article is about L Carinae. For l Carinae, see
HD 84810 .
HD 90264 is a binary star [ 4] system in the southern constellation of Carina . It has the Bayer designation of L Carinae , while HD 90264 is the star's identifier in the Henry Draper catalogue . This system has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.97.[ 2] It is located at a distance of approximately 402 light years from the Sun based on parallax , and is drifting further away with a radial velocity of around +12 km/s.[ 2] The system is a member of the Lower Centaurus Crux association of the Sco-Cen Complex .[ 4]
This system was found to be a close double-lined spectroscopic binary in 1977, consisting of two B-type main-sequence stars . It has a near circular orbit with a period of 15.727 days and a semimajor axis of 0.2449 AU . They appear to be spin-orbit synchronized . Both stars appear to be deficient in helium. The primary is a helium variable star while the companion is a mercury-manganese star . The variability of both stars aligns favorably with the orbital period.[ 4]
References
^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653– 664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 .
^ 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 .
^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H .
^ a b c d e f g h i Quiroga, C.; et al. (October 2010), "The chemically peculiar double-lined spectroscopic binary HD 90264", Astronomy and Astrophysics , 521 : 7, Bibcode :2010A&A...521A..75Q , doi :10.1051/0004-6361/201014521 , A75.
^ "HD 90264" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-26 .