Star in the constellation Carina
This article is about r Carinae. For the variable star, see R Carinae .
HD 91942
Observation dataEpoch J2000.0 Equinox J2000.0
Constellation
Carina
Right ascension
10 35 35.29721
Declination
−57° 33′ 27.4835″
Apparent magnitude (V)
4.45
Characteristics
Evolutionary stage
Bright giant
Spectral type
K3II-IIb
B−V color index
1.604±0.004
Variable type
Suspected
Astrometry Radial velocity (Rv )+9.9±0.7 km/s Proper motion (μ) RA: −15.93 mas /yr Dec.: +0.49 mas /yr Parallax (π)2.77 ± 0.17 mas Distance 1,180 ± 70 ly pc ) Absolute magnitude (MV )−3.77 Details Mass 8.1±0.7 M ☉ Radius 155.5+5.6R ☉ Luminosity 5,485±693 L ☉ Surface gravity (log g )2.0 cgs Temperature 3,983+152K Metallicity 0.0 dex Rotational velocity (v sin i )5.8 km/s Age 35.7±8.3 Myr Other designations r Car , NSV 4904, CPD −56°3544, FK5 393, GC 14570, HD 91942, HIP 51849, HR 4159, SAO 238222 Database references SIMBAD data
HD 91942 is a single variable star in the constellation Carina . It has the Bayer designation r Carinae , while HD 91942 is the identifier from the Henry Draper catalogue apparent visual magnitude of 4.45. Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun . The star has an absolute magnitude of −3.77, and is drifting further away with a radial velocity of +9.9 km/s.
This object is a massive, aging bright giant with a stellar classification of K3II-IIb. 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 . With the supply of hydrogen exhausted at its core , it has evolved of the main sequence and cooled and expanded to 156 times the Sun's radius . It is an estimated 36 million years old with eight times the mass of the Sun . It is radiating around 5,500 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,983 K.
References
^ 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 .
^ 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 .
^ 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 .
^ 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 .
^ 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 .
^ 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 .
^ 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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