| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 08 55 02.82822 |
| Declination | −60° 38′ 40.5998″ |
| Apparent magnitude (V) | +3.84 |
| Characteristics | |
| Evolutionary stage | Bright giant |
| Spectral type | B8/9II |
| B−V color index | −0.104±0.006 |
| Variable type | Constant |
| Astrometry | |
| Radial velocity (Rv) | +25.0±4.1 km/s |
| Proper motion (μ) | RA: −28.18 mas/yr Dec.: +41.48 mas/yr |
| Parallax (π) | 10.20 ± 0.10 mas |
| Distance | 320 ± 3 ly (98.0 ± 1.0 pc) |
| Absolute magnitude (MV) | −1.12 |
| Details | |
| Radius | 5.0 R☉ |
| Luminosity | 449.05 L☉ |
| Temperature | 11,880 K |
| Other designations | |
| c Car, CD−60°1243, FK5 336, GC 12359, HD 76728, HIP 43783, HR 3571, SAO 250374, CCDM J08550-6039, WDS J08550-6039A | |
| Database references | |
| SIMBAD | data |
HD 76728 is a suspected astrometric binary star system in the constellation Carina. It has the Bayer designation c Carinae; HD 76728 is the identifier from the Henry Draper catalogue. The visible component has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.84. The system is located at a distance of approximately 320 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of around +25 km/s. It is a candidate member of the Volans-Carina Association of co-moving stars.
The visible component is an aging bright giant star with a stellar classification of B8/9II. The spectrum of the star displays metallic lines of magnesium. The Volans-Carina Association to which it belongs has an age of 90 million years. The star has five times the radius of the Sun and is radiating 449 times the Sun's luminosity from its photosphere at an effective temperature of 11,880 K.
References
- ^ 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, S2CID 18759600.
- ^ 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
- Adelman, S. J.; et al. (September 2000), "On the Variability of O and B Supergiants", Information Bulletin on Variable Stars, 4946: 1, Bibcode:2000IBVS.4946....1A.
- ^ Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601
- "HD 76728". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-20.
- 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
- ^ Gagné, Jonathan; et al. (October 2018), "Volans-Carina: A New 90 Myr Old Stellar Association at 85 pc", The Astrophysical Journal, 865 (2): 13, arXiv:1808.04420, Bibcode:2018ApJ...865..136G, doi:10.3847/1538-4357/aadaed, S2CID 119402144, 136.
- Garrison, R. F.; Gray, R. O. (April 1994), "The Late B-Type Stars: Refined MK Classification, Confrontation With Stromgren Photometry, And The Effects of Rotation", Astronomical Journal, 107: 1556, Bibcode:1994AJ....107.1556G, doi:10.1086/116967.
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