Astronomy:HD 81101
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | |
| 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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A
- ↑ 3.0 3.1 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
- ↑ 4.0 4.1 4.2 4.3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 5.0 5.1 5.2 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, doi:10.1093/mnras/stv189, Bibcode: 2015MNRAS.448.2749A.
- ↑ "HD 81101". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+81101.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics 575: 13, doi:10.1051/0004-6361/201425221, A35, Bibcode: 2015A&A...575A..35B.
- ↑ 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, doi:10.1086/132442, Bibcode: 1989PASP..101..366E.
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