Astronomy:HD 106760
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 318 ± 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] | |
| Mass | 1.85±0.14 M☉ |
| Radius | 16.79±0.79 R☉ |
| Luminosity | 112[6] L☉ |
| Surface gravity (log g) | 2.48±0.10 cgs |
| Temperature | 4,581±28 K |
| Metallicity [Fe/H] | −0.12±0.05 dex |
| Rotational velocity (v sin i) | 0.9[6] km/s |
| Age | 1.57±0.32 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 318 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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K
- ↑ 4.0 4.1 Pourbaix, D. et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics 424: 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 5.0 5.1 5.2 Maldonado, J.; Villaver, E. (April 2016), "Evolved stars and the origin of abundance trends in planet hosts", Astronomy & Astrophysics 588: 11, doi:10.1051/0004-6361/201527883, A98, Bibcode: 2016A&A...588A..98M.
- ↑ 6.0 6.1 6.2 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ "HD 106760". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+106760.
- ↑ 8.0 8.1 Griffin, R. F. (June 1984), "Spectroscopic binaries near the North Galactic Pole. X - HR 4668", Journal of Astrophysics and Astronomy 5: 181−185, doi:10.1007/BF02714990, Bibcode: 1984JApA....5..181G.
 |  |
