Astronomy:HD 80230
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 490 ± 10 ly (150 ± 3 pc) |
| Absolute magnitude (MV) | −1.53[2] |
| Details | |
| Mass | 2.2±0.3[5] M☉ |
| Radius | 74.86+3.84 −5.71[6] R☉ |
| Luminosity | 1,172±60[6] L☉ |
| Surface gravity (log g) | 0.95±0.12[5] cgs |
| Temperature | 3,904+158 −96[6] K |
| Other designations | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V, https://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 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 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Samus', N. N. et al. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 5.0 5.1 5.2 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, doi:10.1051/0004-6361/201834514, A35, Bibcode: 2019A&A...624A..35K.
- ↑ 6.0 6.1 6.2 6.3 6.4 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.
- ↑ "HD 80230". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+80230.
- ↑ 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.
- ↑ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ Lu, Phillip K. (June 1991), "Taxonomy of Barium Stars", Astronomical Journal 101: 2229, doi:10.1086/115845, Bibcode: 1991AJ....101.2229L.
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