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HD 80230

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HD 80230
Carina constellation map.svg
Red circle.svg
Location of HD 80230 (circled in red)
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Carina
Right ascension 09h 16m 12.07286s [1]
Declination −57° 32′ 29.3007″ [1]
Apparent magnitude  (V)4.34 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type M0.5IIIa [4]
B−V color index +1.602±0.079 [2]
Variable type Suspected [5]
Astrometry
Radial velocity (Rv)−5.2±0.7 [2] km/s
Proper motion (μ)RA: −27.15 [1] mas/yr
Dec.: −14.18 [1] mas/yr
Parallax (π)6.68±0.15  mas [1]
Distance 490 ± 10  ly
(150 ± 3  pc)
Absolute magnitude  (MV)−1.53 [2]
Details
Mass 2.2±0.3 [6]   M☉
Radius 74.86+3.84
−5.71 [7]   R☉
Luminosity 1,172±60 [7]   L☉
Surface gravity (log g)0.95±0.12 [6]   cgs
Temperature 3,904+158
−96 [7]   K
Other designations
g Car, NSV 4440, CPD−57°1961, GC 12813, HD 80230, HIP 45496, HR 3696, SAO 236787 [8]
Database references
SIMBAD data

HD 80230 is a single [9] star in the southern constellation of Carina, near the northern constellation border with Vela. It has the Bayer designation g Carinae, while HD 80230 is the star's identifier in the Henry Draper catalogue . This is a suspected variable star with a brightness that has been measured varying from magnitude 4.31 down to 4.35, [5] both of which is bright enough for the star to be visible to the naked eye. The distance to this object is approximately 490  light years based on parallax, [1] but it is drifting closer to the Sun with a radial velocity of −5 km/s. [2]

This object is an aging red giant, currently on the asymptotic giant branch, [10] with a stellar classification of M0.5IIIa. [4] It is a mild barium star, showing trace enhancement of s-process elements in its spectrum. [11] The star has 2.2 [6] times the mass of the Sun and has expanded to 75 [7] times the Sun's radius. It is radiating 1,172 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,904 K. [7]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode: 2007A&A...474..653V , doi: 10.1051/0004-6361:20078357 .
  2. 1 2 3 4 5 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. ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  4. 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. 1 2 Samus', N. N.; et al. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  6. 1 2 3 Kallinger, T.; et al. (April 2019), "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation", Astronomy & Astrophysics, 624: 17, arXiv: 1902.07531 , Bibcode:2019A&A...624A..35K, doi:10.1051/0004-6361/201834514, S2CID   102486794, A35.
  7. 1 2 3 4 5 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.
  8. ↑ "HD 80230". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-26.
  9. ↑ 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.
  10. ↑ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  11. ↑ Lu, Phillip K. (June 1991), "Taxonomy of Barium Stars", Astronomical Journal, 101: 2229, Bibcode:1991AJ....101.2229L, doi: 10.1086/115845 .
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