V376 Carinae

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V376 Carinae
V376CarLightCurve.png
A light curve for V376 Carinae, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Carina
Right ascension 08h 56m 58.41666s [2]
Declination −59° 13′ 45.6032″ [2]
Apparent magnitude  (V)4.69 [3] (4.87 + 6.58) [4]
Characteristics
Spectral type B2V [5] + B9.5V [3]
B−V color index −0.182±0.004 [6]
Astrometry
Radial velocity (Rv)+26.8±2.8 [6]  km/s
Proper motion (μ)RA: −8.409±0.406 [2]   mas/yr
Dec.: +8.421±0.322 [2]   mas/yr
Parallax (π)5.0495 ± 0.1667  mas [2]
Distance 650 ± 20  ly
(198 ± 7  pc)
Absolute magnitude  (MV)−1.64 [6]
Details
A
Mass 7.8±0.1 [7]   M☉
Luminosity (bolometric)2,998 [8]   L☉
Temperature 21,150 [8]   K
Age 12.5±1.6 [7]   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 [9]
Database references
SIMBAD data

V376 Carinae is a binary star [3] 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. [3] The distance to this system from the Sun is approximately 650  light years based on parallax. [2] It is drifting further away with a radial velocity of +27 km/s. [6]

The magnitude 4.87 [4] primary, designated component A, is a B-type main-sequence star with a stellar classification of B2V. [5] During a search for Beta Cephei variables in the southern sky, it was initially classed as a very short period variable. [10] However, this variability was not confirmed by subsequent observations. [11] Samus et al. (2017) now suspect it is a constant star that was assigned a variable designation in haste. [12] It has an estimated age of 12.5 million years with 7.8 times the mass of the Sun. [7] The star is radiating nearly three thousand times the Sun's luminosity from its photosphere at an effective temperature of 21,150 K. [8]

The companion star, component B, was discovered by Scottish astronomer James Dunlop in 1836. [4] It has a class of B9.5V [3] 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°. [4]

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 4 5 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.
  4. 1 2 3 4 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 .
  5. 1 2 Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  6. 1 2 3 4 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.
  7. 1 2 3 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.
  8. 1 2 3 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
  9. ↑ "HD 77002". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-08-08.
  10. ↑ 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 .
  11. ↑ Balona, L. A. (March 1982). "Observations of Early-Type Ultra-Short Period Variables". Information Bulletin on Variable Stars. 2120: 1. Bibcode:1982IBVS.2120....1B.
  12. ↑ 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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