HD 91942
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Carina |
Right ascension | 10h 35m 35.29721s[1] |
Declination | −57° 33′ 27.4835″[1] |
Apparent magnitude (V) | 4.45[2] |
Characteristics | |
Evolutionary stage | Bright giant[3] |
Spectral type | K3II-IIb[4] |
B−V color index | 1.604±0.004[2] |
Variable type | Suspected[5] |
Astrometry | |
Radial velocity (Rv) | +9.9±0.7[2] km/s |
Proper motion (μ) | RA: −15.93[1] mas/yr Dec.: +0.49[1] mas/yr |
Parallax (π) | 2.77 ± 0.17 mas[1] |
Distance | 1,180 ± 70 ly (360 ± 20 pc) |
Absolute magnitude (MV) | −3.77[2] |
Details | |
Mass | 8.1±0.7[6] M☉ |
Radius | 155.5+5.6 −11.3[7] R☉ |
Luminosity | 5,485±693[7] L☉ |
Surface gravity (log g) | 2.0[3] cgs |
Temperature | 3,983+152 −69[7] K |
Metallicity [Fe/H] | 0.0[3] dex |
Rotational velocity (v sin i) | 5.8[3] km/s |
Age | 35.7±8.3[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 91942 is a single[9] variable star in the constellation Carina. It has the Bayer designation r Carinae, while HD 91942 is the identifier from the Henry Draper catalogue. This orange-hued object is visible to the naked eye with an apparent visual magnitude of 4.45.[2] Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun.[1] The star has an absolute magnitude of −3.77,[2] and is drifting further away with a radial velocity of +9.9 km/s.[2]
This object is a massive, aging bright giant with a stellar classification of K3II-IIb.[4] It is a suspected variable star that fluctuates in magnitude by an amplitude of 0.05 in the B-band of the UBV photometric system.[5] With the supply of hydrogen exhausted at its core, it has evolved of the main sequence and cooled and expanded to 156[7] times the Sun's radius. It is an estimated 36[6] million years old with eight[6] times the mass of the Sun. It is radiating around 5,500[7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,983 K.[7]
References
- ^ 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.
- ^ a b c d e f g 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.
- ^ a b c d Lèbre, A.; de Laverny, P.; Do Nascimento, J. D., Jr.; de Medeiros, J. R. (May 2006), "Lithium abundances and rotational behavior for bright giant stars", Astronomy and Astrophysics, 450 (3): 1173–1179, Bibcode:2006A&A...450.1173L, doi:10.1051/0004-6361:20053485.
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: CS1 maint: multiple names: authors list (link) - ^ 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.
- ^ a b Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
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: CS1 maint: unflagged free DOI (link) - ^ a b c d e f 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.
- ^ "HD 91942". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
- ^ 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.
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: CS1 maint: unflagged free DOI (link)