V376 Carinae

V376 Carinae is a binary star[2] system in the southern constellation of Carina. It has the Bayer designation b1 Carinae; V376 Carinae is the variable star designation. The system is visible to the naked eye as a faint point of light with a combined apparent magnitude of +4.69.[2] The distance to this system from the Sun is approximately 650 light years based on parallax.[1] It is drifting further away with a radial velocity of +27 km/s.[5]

This article is about b1 Carinae. For b2 Carinae, see HD 77370. For B Carinae, see HR 3220.
V376 Carinae
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 08h 56m 58.41666s[1]
Declination −59° 13′ 45.6032″[1]
Apparent magnitude (V) 4.69[2] (4.87 + 6.58)[3]
Characteristics
Spectral type B2V[4] + B9.5V[2]
B−V color index −0.182±0.004[5]
Astrometry
Radial velocity (Rv)+26.8±2.8[5] km/s
Proper motion (μ) RA: −8.409±0.406[1] mas/yr
Dec.: +8.421±0.322[1] mas/yr
Parallax (π)5.0495 ± 0.1667[1] mas
Distance650 ± 20 ly
(198 ± 7 pc)
Absolute magnitude (MV)−1.64[5]
Details
A
Mass7.8±0.1[6] M☉
Luminosity (bolometric)2,998[7] L☉
Temperature21,150[7] K
Age12.5±1.6[6] Myr
Other designations
b1 Car, V376 Carinae, CD−58°1301, FK5 1233, GC 12405, HD 77002, HIP 43937, HR 3582, SAO 236436, CCDM J08570-5914, WDS J08570-5914[8]
Database references
SIMBADdata

The magnitude 4.87[3] primary, designated component A, is a B-type main-sequence star with a stellar classification of B2V.[4] During a search for Beta Cephei variables in the southern sky, it was initially classed as a very short period variable.[9] However, this variability was not confirmed by subsequent observations.[10] Samus et al. (2017) now suspect it is a constant star that was assigned a variable designation in haste.[11] It has an estimated age of 12.5 million years with 7.8 times the mass of the Sun.[6] The star is radiating nearly three thousand times the Sun's luminosity from its photosphere at an effective temperature of 21,150 K.[7]

The companion star, component B, was discovered by Scottish astronomer James Dunlop in 1836.[3] It has a class of B9.5V[2] with an apparent magnitude of +6.58. As of 2010, the secondary had an angular separation of 40.1″ from the primary along a position angle of 76°.[3]

References
  1. 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.
  2. Eggleton, P. P.; Tokovinin, A. A. (September 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.
  3. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
  4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  5. 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.
  6. Tetzlaff, N.; et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  7. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483
  8. "HD 77002". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-08.
  9. Jakate, S. M. (April 1979). "A search for Beta Cephei stars. III. Photometric studies of southern B-type stars". Astronomical Journal. 84: 552–558. Bibcode:1979AJ.....84..552J. doi:10.1086/112448.
  10. Balona, L. A. (March 1982). "Observations of Early-Type Ultra-Short Period Variables". Information Bulletin on Variable Stars. 2120: 1. Bibcode:1982IBVS.2120....1B.
  11. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
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