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HD 81101 is a single[7] star in the southern constellation of Carina. It has the Bayer designation k Carinae, while HD 81101 is the star's designation in the Henry Draper catalogue. The star has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.79.[2] It is located at a distance of approximately 225 light years from the Sun based on parallax.[1] This object is drifting further away with a radial velocity of +51 km/s,[1] having come to within 22 light-years of the Sun some 1.4 million years ago.[8]

This article is about k Carinae. For K Carinae, see HR 4138.
HD 81101
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 09h 20m 56.81329s[1]
Declination −62° 24′ 16.6811″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type G6III[3]
B−V color index +0.926±0.035[2]
Astrometry
Radial velocity (Rv)+51.12±0.15[1] km/s
Proper motion (μ) RA: −27.15[1] mas/yr
Dec.: −14.18[1] mas/yr
Parallax (π)14.4946 ± 0.1593 mas[1]
Distance225 ± 2 ly
(69.0 ± 0.8 pc)
Absolute magnitude (MV)0.51[2]
Details
Mass1.95[4] M☉
Radius11.19+0.19
−0.15[1] R☉
Luminosity65.4±0.9[1] L☉
Surface gravity (log g)2.720±0.050[5] cgs
Temperature4,908+43
−33[1] K
Metallicity [Fe/H]−0.360±0.020[5] dex
Age2.04[4] Gyr
Other designations
k Car, CPD−61°1242, FK5 2745, GC 12923, HD 81101, HIP 45856, HR 3728, SAO 250544[6]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of G6III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded away from the main sequence. It is two[4] billion years old with 1.95[4] times the mass of the Sun and has expanded to 11[1] times the Sun's radius. The star is radiating 65[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,908 K.[1] Being a member of the old disk population,[9] the metallicity of the star's stellar atmosphere is much lower than solar.[5]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  5. Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.
  6. "HD 81101". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.
  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. Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
  9. Eggen, Olin J. (April 1989), "Large and Kinematically Unbiased Samples of G- and K-Type Stars. IV. Evolved Stars of the Old Disk Population", Publications of the Astronomical Society of the Pacific, 101: 366, Bibcode:1989PASP..101..366E, doi:10.1086/132442.

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