HD 83944

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 mas[1]
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

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]

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]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gagné2018 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference chini2012 was invoked but never defined (see the help page).