Wikipedia
HD 83944
HD 83944 is a star system in the constellation Carina. This has the Bayer designation m Carinae, while HD 83944 is the identifier from the Henry Draper catalogue. It is a suspected variable with an apparent visual magnitude that fluctuates around 4.51[2] with an amplitude of 0.5.[8] The system is located at a distance of approximately 226 light years from the Sun based on parallax, and it has an absolute magnitude of 0.31.[2] It is a member of the Carina association of co-moving stars.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 09h 39m 20.99948s[1] |
| Declination | −61° 19′ 41.0167″[1] |
| Apparent magnitude (V) | 4.51[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | B9IV/V[4] |
| B−V color index | −0.070±0.340[2] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | 20.0±4.2[2] km/s |
| Proper motion (μ) | RA: −34.09[1] mas/yr Dec.: +18.55[1] mas/yr |
| Parallax (π) | 14.45 ± 0.15 mas[1] |
| Distance | 226 ± 2 ly (69.2 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.31[2] |
| Details | |
| Mass | 2.88±0.03[3] M☉ |
| Luminosity | 95.71[2] L☉ |
| Surface gravity (log g) | 4.33±0.14[6] cgs |
| Temperature | 11,561±393[6] K |
| Rotational velocity (v sin i) | 36[3] or 51[6] km/s |
| Age | 99[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Although previously believed to be a single star,[10] Chini et al. (2012) found this to be a double-lined spectroscopic binary.[11] The stellar classification of B9IV/V matches a star that is entering the subgiant phase,[4] although stellar models suggest it is still in the main sequence.[3]
References edit
- ^ a b c d e 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.
- ^ a b c d e f g 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.
- ^ a b c d Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b 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.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S.
- ^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "HD 83944". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.
- ^ 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.
- ^ Gagné, Jonathan; Faherty, Jacqueline K. (August 2018), "BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2", The Astrophysical Journal, 862 (2): 12, arXiv:1805.11715, Bibcode:2018ApJ...862..138G, doi:10.3847/1538-4357/aaca2e, S2CID 119196799, 138.
- ^ 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.
- ^ Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x, S2CID 119120749.