HD 76728

This article is about c Carinae. For C Carinae, see HD 69863.

HD 76728

Observation data Epoch J2000.0       Equinox J2000.0
Constellation	Carina
Right ascension	08h 55m 02.82822s [1]
Declination	−60° 38′ 40.5998″ [1]
Apparent magnitude  (V)	+3.84 [2]
Characteristics
Evolutionary stage	Bright giant
Spectral type	B8/9II [3]
B−V color index	−0.104±0.006 [2]
Variable type	Constant [4]
Astrometry
Radial velocity (Rv)	+25.0±4.1 [2]  km/s
Proper motion (μ)	RA: −28.18 [1]   mas/yr Dec.: +41.48 [1]   mas/yr
Parallax (π)	10.20 ± 0.10  mas [1]
Distance	320 ± 3  ly (98.0 ± 1.0  pc)
Absolute magnitude  (MV)	−1.12 [2]
Details
Radius	4.057 [5]   R☉
Luminosity	446 [5]   L☉
Temperature	13,180 [5]   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 [6]
Database references
SIMBAD	data

HD 76728 is a suspected astrometric binary ^[7] 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. ^[2] The system is located at a distance of approximately 320  light years from the Sun based on parallax, ^[1] and it is drifting further away with a radial velocity of around +25 km/s. ^[2] It is a candidate member of the Volans-Carina Association of co-moving stars. ^[8]

The visible component is an aging bright giant star with a stellar classification of B8/9II. ^[3] The spectrum of the star displays metallic lines of magnesium. ^[9] The Volans-Carina Association to which it belongs has an age of 90 million years. ^[8] The star has four times the radius of the Sun and is radiating 450 times the Sun's luminosity from its photosphere at an effective temperature of 13,180 K. ^[5]

References

1. 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.
2. 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.
3. 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
4. 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.
5. Kochukhov, O.; Khalack, V.; Kobzar, O.; Neiner, C.; Paunzen, E.; Labadie-Bartz, J.; David-Uraz, A. (2021-08-10), "TESS survey of rotational and pulsational variability of mercury-manganese stars", Monthly Notices of the Royal Astronomical Society, 506 (4): 5328–5344, arXiv: 2107.09096 , doi: 10.1093/mnras/stab2107 , ISSN   0035-8711.
6. "HD 76728". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-20.
7. 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
8. 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.
9. 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.