HD 81101

Last updated
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]
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

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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. 1 2 3 4 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. 1 2 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. 1 2 3 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. 1 2 3 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 , S2CID   121365843.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.