HD 91190

HD 91190 is a suspected astrometric binary[7] star system in the northern circumpolar constellation of Draco. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.86.[2] The distance to HD 91190, as estimated from its annual parallax shift of 4.5 mas,[1] is around 720 light years. This system is moving further away from the Sun with a heliocentric radial velocity of +17 km/s,[4] having come to within 170 ly some 2.4 million years ago.[2]

HD 91190
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension  10h 35m 05.49379s[1]
Declination +75° 42′ 46.4541″[1]
Apparent magnitude (V) 4.86[2]
Characteristics
Spectral type G8 III-IIIb[3]
B−V color index 0.957±0.003[2]
Astrometry
Radial velocity (Rv)+16.6[4] km/s
Proper motion (μ) RA: −0.599[1] mas/yr
Dec.: −17.436[1] mas/yr
Parallax (π)4.5045 ± 0.1730[1] mas
Distance720 ± 30 ly
(222 ± 9 pc)
Absolute magnitude (MV)+0.46[2]
Details
Mass2.39[4] M☉
Luminosity69[4] L☉
Surface gravity (log g)2.59[5] cgs
Temperature4,965±106[4] K
Metallicity [Fe/H]−0.03[5] dex
Age2.06[4] Gyr
Other designations
BD+76° 393, FK5 395, HD 91190, HIP 51808, HR 4126, SAO 7164[6]
Database references
SIMBADdata

At the age of about two billion years,[4] this is an evolved G-type giant star with a stellar classification of G8 III-IIIb.[3] It has 2.39[4] times the mass of the Sun and is radiating 69[4] times the Sun's luminosity from its photosphere at an effective temperature of around 4,965 K.[4]

References
  1. 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.
  2. 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.
  3. 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.
  4. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
  5. Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, 94.
  6. "HD 91190". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-17.
  7. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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