HD 81101

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[1] mas
Distance	225 ± 2 ly ; (69.0 ± 0.8 pc)
Absolute magnitude (MV)	0.51[2]
Details
Mass	1.95[4] M☉
Radius	11.19+0.19; −0.15[1] R☉
Luminosity	65.4±0.9[1] L☉
Surface gravity (log g)	2.720±0.050[5] cgs
Temperature	4,908+43; −33[1] K
Metallicity [Fe/H]	−0.360±0.020[5] dex
Age	2.04[4] Gyr
Other designations
	k Car, CPD−61°1242, FK5 2745, GC 12923, HD 81101, HIP 45856, HR 3728, SAO 250544[6]
Database references
SIMBAD	data

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 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

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.
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
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
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.
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.
"HD 81101". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.
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.
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, A35.
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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[GaiaDR2-1] 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.

[Anderson2012-2] 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

[houk1979-3] 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

[Luck2015-4] 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.

[Alves2015-5] 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.

[SIMBAD-6] "HD 81101". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.

[Eggleton2008-7] 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.

[BailerJones2015-8] 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, A35.

[Eggen1989-9] 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.