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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  mas [1]
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
SIMBAD data

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 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. ^ a b c d e f 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. ^ a b c d e 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. ^ a b 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. ^ a b 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. ^ a b c 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. ^ a b c d e 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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