HD 91942

Last updated
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
r Car, NSV  4904, CPD−56°3544, FK5  393, GC  14570, HD  91942, HIP  51849, HR  4159, SAO  238222 [8]
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]

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References

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  2. 1 2 3 4 5 6 7 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.
  3. 1 2 3 4 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 .
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 3 4 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.
  7. 1 2 3 4 5 6 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.
  8. ↑ "HD 91942". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-30.
  9. ↑ 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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