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]

This article is about m Carinae. For M Carinae, see HD 88981.
HD 83944
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[1] mas
Distance226 ± 2 ly
(69.2 ± 0.7 pc)
Absolute magnitude (MV)0.31[2]
Details
Mass2.88±0.03[3] M☉
Luminosity95.71[2] L☉
Surface gravity (log g)4.33±0.14[6] cgs
Temperature11,561±393[6] K
Rotational velocity (v sin i)36[3] or 51[6] km/s
Age99[6] Myr
Other designations
m Car, NSV 4577, CPD−60°1477, GC 13355, HD 83944, HIP 47391, HR 3856, SAO 250653[7]
Database references
SIMBADdata

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
  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.
  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.
  3. 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.
  4. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. 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.
  6. 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.
  7. "HD 83944". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.
  8. 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.
  9. 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, 138.
  10. 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.
  11. 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.
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