HD 106760

HD 106760 is a single-lined spectroscopic binary[8] star system in the northern constellation of Coma Berenices. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.99.[2] The system is located around 38 light years away, as determined from its annual parallax shift of 10.2417 mas.[1] It is moving closer with a heliocentric radial velocity of −40 km/s, and is expected to come as close as 259 ly in about 772,000 years.[2]

HD 106760
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension  12h 16m 30.12328s[1]
Declination +33° 03′ 41.4198″[1]
Apparent magnitude (V) 4.99[2]
Characteristics
Spectral type K0.5 III–IIIb[3]
B−V color index 1.140±0.002[2]
Astrometry
Radial velocity (Rv)−40.4±0.3[2] km/s
Proper motion (μ) RA: −41.979[1] mas/yr
Dec.: −105.115[1] mas/yr
Parallax (π)10.2417 ± 0.2354[1] mas
Distance318 ± 7 ly
(98 ± 2 pc)
Absolute magnitude (MV)0.06[2]
Orbit[4]
Period (P)3.598 years (1,314.3 d)
Eccentricity (e)0.43
Longitude of the node (Ω)303.6°
Periastron epoch (T)2441468.5 JD
Semi-amplitude (K1)
(primary)		6.5 km/s
Details[5]
Mass1.85±0.14 M☉
Radius16.79±0.79 R☉
Luminosity112[6] L☉
Surface gravity (log g)2.48±0.10 cgs
Temperature4,581±28 K
Metallicity [Fe/H]−0.12±0.05 dex
Rotational velocity (v sin i)0.9[6] km/s
Age1.57±0.32 Gyr
Other designations
BD+33° 2213, FK5 2983, HD 106760, HIP 59856, HR 4668, SAO 62928[7]
Database references
SIMBADdata

The variable radial velocity of HD 106760 was announced by W. W. Campbell of Lick Observatory in 1922, indicating the binary nature of this system. A preliminary orbit was determined by Mount Wilson Observatory astronomer W. H. Christie in 1936, then refined by English astronomer R. F. Griffin in 1984.[8] The components of this system orbit each other with a period of 3.6 years and an eccentricity of 0.43.[4]

The visible component has a stellar classification of K0.5 III–IIIb,[3] indicating it is an evolved K-type giant star. It is around 1.6 billion years old with 1.9 times the mass of the Sun and has expanded to 17 times the Sun's radius.[5] The star is radiating 112[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,581 K.[5]

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. Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
  5. Maldonado, J.; Villaver, E. (April 2016), "Evolved stars and the origin of abundance trends in planet hosts", Astronomy & Astrophysics, 588: 11, arXiv:1602.00835, Bibcode:2016A&A...588A..98M, doi:10.1051/0004-6361/201527883, A98.
  6. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  7. "HD 106760". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-13.
  8. Griffin, R. F. (June 1984), "Spectroscopic binaries near the North Galactic Pole. X - HR 4668", Journal of Astrophysics and Astronomy, 5: 181−185, Bibcode:1984JApA....5..181G, doi:10.1007/BF02714990.
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