Astronomy:HD 91942
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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
- ↑ 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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 3.2 3.3 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, doi:10.1051/0004-6361:20053485, Bibcode: 2006A&A...450.1173L.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 6.2 6.3 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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 91942". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+91942.
- ↑ 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.
Coordinates: 
10h 27m 52.7s, −58° 44′ 22″
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