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]

Related Research Articles

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<span class="mw-page-title-main">Theta Trianguli Australis</span> Star in the constellation Triangulum Australe

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<span class="mw-page-title-main">Iota Tucanae</span> Star in the constellation Tucana

Iota Tucanae is a solitary star in the southern constellation of Tucana. Based upon an annual parallax shift of 10.72 mas as seen from Earth, it is located around 304 light years from the Sun. With an apparent visual magnitude of +5.33, it is faintly visible to the naked eye.

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ι Crucis, Latinized as Iota Crucis, is a wide double star in the southern constellation of Crux. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4m.69. This object is located 125 light-years from the Sun, based on parallax, and is drifting further away with a radial velocity of +7.5 km/s.

<span class="mw-page-title-main">Beta Mensae</span> Star in the constellation Mensa

Beta Mensae, Latinized from β Mensae, is the third-brightest star in the constellation of Mensa. Despite this, it is only faintly visible to the naked eye, appearing as a dim, yellow-hued point of light with an apparent visual magnitude of 5.31. The star is positioned near the southwest edge of the Large Magellanic Cloud, but it does not form part of this much more distant satellite galaxy. Based upon an annual parallax shift of just 4.11 mas as seen from the Earth, the star is located at a distance of roughly 790 light years from the Sun. It is moving closer with a heliocentric radial velocity of −11 km/s.

<span class="mw-page-title-main">Eta Reticuli</span> Star in the constellation Reticulum

Eta Reticuli, Latinized from η Reticuli, is a solitary star in the southern constellation of Reticulum. With an apparent visual magnitude of 5.22, it is faintly visible to the naked eye on a dark night. Based upon an annual parallax shift of 8.48 mas, it is located at a distance of roughly 385 light years from the Sun. It may be a member of the high-velocity Zeta Herculis Moving Group of stars that share a common motion through space.

<span class="mw-page-title-main">Delta Piscis Austrini</span> Star in the constellation Piscis Austrinus

Delta Piscis Austrini, Latinized from δ Piscis Austrini, is a yellow-hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.175. There is a magnitude 9.86 common proper motion companion located at an angular separation of 5.2 arc seconds – the pair most likely form a binary star system. Based upon an annual parallax shift of 18.9796 mas as seen from the Gaia satellite, Delta Piscis Austrini is located 172 ± 2 light-years from the Sun.

HD 123569 is a single star in the southern constellation of Centaurus, positioned near the eastern constellation border with Lupus. This object has a yellowish hue and is visible to the naked eye with an apparent visual magnitude of 4.74. It is located at a distance of approximately 176 light years from the Sun based on parallax, and it has an absolute magnitude of +1.00. The star is drifting closer with a radial velocity of −17 km/s. O. J. Eggen flagged this star as a member of the Hyades Supercluster.

<span class="mw-page-title-main">HD 24160</span> G-type giant star in the constellation Eridani

HD 24160 is a single star in the equatorial constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.17. The distance to HD 24160 can be estimated from its annual parallax shift of 15.0 mas, yielding a separation of 217 light years. It is moving further from the Earth with a heliocentric radial velocity of +2 km/s. This object is a coronal member of the Ursa Major Moving Group of stars that share a common motion through space.

<span class="mw-page-title-main">HD 12055</span> Candidate binary star system in the constellation Phoenix

HD 12055 is a candidate astrometric binary star system in the southern constellation of Phoenix, near the eastern constellation border with Eridanus. It is yellow in hue and is visible to the naked eye with an apparent visual magnitude of 4.82. The system is located at a distance of approximately 249 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13 km/s.

ν Gruis, Latinised as Nu Gruis, is a solitary, yellow-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 5.47. The distance to this star, as determined using an annual parallax shift of 11.6 mas as seen from the Earth, is 280 light years. It is drifting further away with a heliocentric radial velocity of +11 km/s.

λ Pictoris, Latinised as Lambda Pictoris, is a solitary, orange-hued star in the southern constellation of Pictor. It is visible to the naked eye, having an apparent visual magnitude of +5.29. With an annual parallax shift of 8.71 mas as seen from the Earth, it is located around 374 light-years from the Sun. At the estimated age of 2.24 billion years old, it is an evolved K-type giant star with a stellar classification of K0/1 III. Lambda Pictoris has 2.2 times the mass of the Sun and is radiating 112 times the Sun's luminosity from its photosphere at an effective temperature of 4,581 K.

γ Horologii, Latinised as Gamma Horologii, is a solitary star in the southern constellation of Horologium. It is just bright enough to be visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of +5.74. This object is located at a distance of 183 light years from the Sun, but is drifting closer with a radial velocity of −19 km/s.

ξ Mensae, Latinized as Xi Mensae, is a single star in the southern circumpolar constellation of Mensa. It has a yellow-orange hue and is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.84. This object is located about 366 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −5 km/s.

HD 55151 is a solitary star located in the circumpolar constellation Volans. With an apparent magnitude of 6.47, it is near the limit of naked eye visibility. The star is located 512 light years away from the Solar System, but is drifting closer with a heliocentric radial velocity of -13 km/s.

HD 22676 is a solitary star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 5.67, making it faintly visible to the naked eye and is currently located at a distance of 333 light years. However, it is recceding from the sun with a radial velocity of 18.4 km/s.

HD 1032 is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude of 5.77 and is estimated to be 850 light years away from the Solar System based on parallax measure. However, it is receding with a heliocentric radial velocity of 4 km/s.

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.
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