Astronomy:71 Cygni
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 29m 26.94995s[1] |
| Declination | +46° 32′ 26.1024″[1] |
| Apparent magnitude (V) | 5.22[2] |
| Characteristics | |
| Spectral type | K0− III[3] |
| B−V color index | 0.965±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.54±0.10[4] km/s |
| Proper motion (μ) | RA: +43.048[1] mas/yr Dec.: +104.683[1] mas/yr |
| Parallax (π) | 15.4057 ± 0.1077[1] mas |
| Distance | 212 ± 1 ly (64.9 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.11[2] |
| Details[4] | |
| Mass | 2.05±0.09 M☉ |
| Radius | 8.31±0.32 R☉ |
| Luminosity | 44.7+7.8 −6.7 L☉ |
| Surface gravity (log g) | 3.03±0.05 cgs |
| Temperature | 4,983±18 K |
| Metallicity [Fe/H] | 0.05±0.06 dex |
| Rotational velocity (v sin i) | 2.03±0.85 km/s |
| Age | 1.07±0.15 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
71 Cygni is a star in the northern constellation of Cygnus, located 212 light years from the Sun.[1] 71 Cygni is the Flamsteed designation; it has the Bayer designation g Cygni.[5] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.22.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −21.5 km/s.[4]
At the age of one billion years,[4] this is an evolved giant star with a stellar classification of K0− III,[3] which means it has used up its core hydrogen and expanded. It is a red clump giant, indicating that it is on the horizontal branch of the Hertzsprung–Russell diagram and is generating energy by helium fusion at its center.[6][7] The star has double the mass of the Sun and eight times the Sun's radius. It is radiating 45 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,983 K.[4]
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. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 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 4.2 4.3 4.4 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, Bibcode: 2015A&A...574A..50J.
- ↑ 5.0 5.1 "71 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=71+Cyg.
- ↑ Mishenina, T. V. et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics 456 (3): 1109–1120, doi:10.1051/0004-6361:20065141, Bibcode: 2006A&A...456.1109M.
- ↑ Valentini, M.; Munari, U. (November 2010), "A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample", Astronomy and Astrophysics 522: A79, doi:10.1051/0004-6361/201014870, Bibcode: 2010A&A...522A..79V.
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