HD 91942
Observation data EpochJ2000.0EquinoxJ2000.0 | |
---|---|
Constellation | Carina |
Right ascension | 10h35m35.29721s[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−Vcolor 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 ± 0.17mas[1] |
Distance | 1,180 ± 70ly (360 ± 20pc) |
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(logg) | 2.0[3]cgs |
Temperature | 3,983+152 −69[7]K |
Metallicity[Fe/H] | 0.0[3]dex |
Rotational velocity(vsini) | 5.8[3]km/s |
Age | 35.7±8.3[6]Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 91942is a single[9]variable starin theconstellationCarina.It has theBayer designationr Carinae,whileHD 91942is the identifier from theHenry Draper catalogue.This orange-hued object is visible to the naked eye with anapparent visual magnitudeof 4.45.[2]Based onparallaxmeasurements, it is located at a distance of approximately 1,180light yearsfrom theSun.[1]The star has anabsolute magnitudeof −3.77,[2]and is drifting further away with aradial velocityof +9.9 km/s.[2]
This object is a massive, agingbright giantwith astellar classificationof K3II-IIb.[4]It is a suspectedvariable starthat fluctuates in magnitude by anamplitudeof 0.05 in the B-band of theUBV photometric system.[5]With the supply of hydrogen exhausted at itscore,it hasevolvedof themain sequenceand cooled and expanded to 156[7]times theSun's radius.It is an estimated 36[6]million years old with eight[6]times themass of the Sun.It is radiating around 5,500[7]times theluminosity of the Sunfrom its swollenphotosphereat aneffective temperatureof 3,983 K.[7]
References
[edit]- ^abcdefvan 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.
- ^abcdefgAnderson, 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,S2CID119257644.
- ^abcdLèbre, 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.
- ^abKeenan, 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.
- ^abSamus, 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,S2CID125853869.
- ^abcdTetzlaff, 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,S2CID118629873.
- ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^"HD 91942".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-01-30.
- ^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,S2CID14878976.