Astronomy:V376 Carinae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 | |
| 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]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 4.2 4.3 Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 6.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ 8.0 8.1 8.2 Hohle, M. M. et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H
- ↑ "HD 77002". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+77002.
- ↑ Jakate, S. M. (April 1979). "A search for Beta Cephei stars. III. Photometric studies of southern B-type stars". Astronomical Journal 84: 552–558. doi:10.1086/112448. Bibcode: 1979AJ.....84..552J.
- ↑ Balona, L. A. (March 1982). "Observations of Early-Type Ultra-Short Period Variables". Information Bulletin on Variable Stars 2120: 1. Bibcode: 1982IBVS.2120....1B.
- ↑ Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
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