HD 80230

HD 80230 is a single[8] 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,[4] 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 article is about g Carinae. For G Carinae, see HD 78791.
HD 80230
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
Spectral type M0.5IIIa[3]
B−V color index +1.602±0.079[2]
Variable type Suspected[4]
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[1] mas
Distance490 ± 10 ly
(150 ± 3 pc)
Absolute magnitude (MV)−1.53[2]
Details
Mass2.2±0.3[5] M☉
Radius74.86+3.84
−5.71[6] R☉
Luminosity1,172±60[6] L☉
Surface gravity (log g)0.95±0.12[5] cgs
Temperature3,904+158
−96[6] K
Other designations
g Car, NSV 4440, CPD−57°1961, GC 12813, HD 80230, HIP 45496, HR 3696, SAO 236787[7]
Database references
SIMBADdata

This object is an aging red giant, currently on the asymptotic giant branch,[9] with a stellar classification of M0.5IIIa.[3] It is a mild barium star, showing trace enhancement of s-process elements in its spectrum.[10] The star has 2.2[5] times the mass of the Sun and has expanded to 75[6] 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.[6]

References
  1. 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. 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. 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.
  4. 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.
  5. 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.
  6. 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.
  7. "HD 80230". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-26.
  8. 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.
  9. 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.
  10. 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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