63 Cygni is a single[9] star in the northern constellation of Cygnus, located around 1,030 light years away from Sun. It is visible to the naked eye as an orange-hued star with an apparent visual magnitude of 4.56.[2] 63 Cyg is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 06m 36.103s[1] |
| Declination | +47° 38′ 54.223″[1] |
| Apparent magnitude (V) | 4.56[2] |
| Characteristics | |
| Spectral type | K4 Ib–IIa[3] |
| B−V color index | 1.569±0.012[2] |
| Astrometry | |
| Radial velocity (Rv) | −26.32±0.23[2] km/s |
| Proper motion (μ) | RA: +5.992[4] mas/yr Dec.: −1.067[4] mas/yr |
| Parallax (π) | 2.66 ± 0.29 mas[4] |
| Distance | approx. 1,200 ly (approx. 380 pc) |
| Absolute magnitude (MV) | −2.93[5] |
| Details | |
| Radius | 138[1] R☉ |
| Luminosity | 3,981 - 4,130[1] L☉ |
| Surface gravity (log g) | 1.27[6] cgs |
| Temperature | 3,927[1] K |
| Metallicity [Fe/H] | 0.12[6] dex |
| Rotational velocity (v sin i) | 6.3[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved star showing a stellar spectrum with mixed traits between a bright giant and supergiant. It has been chosen as a spectral standard for the class of K4 Ib–IIa.[3]
For reasons that are not yet clear, 63 Cygni is displaying very long period (982 days) and low-amplitude (742 m/s) variations in radial velocity.[2] The star has expanded to 35[2] times the Sun's radius and is radiating 4,397[5] times the Sun's luminosity from its photosphere at an effective temperature of 4,204 K.[6]
References edit
- ^ a b c d e Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
- ^ a b c d e f g Lee, B. -C.; et al. (June 2014), "Low-amplitude and long-period radial velocity variations in giants HD 3574, 63 Cygni, and HD 216946", Astronomy & Astrophysics, 566: 6, arXiv:1405.5955, Bibcode:2014A&A...566A.124L, doi:10.1051/0004-6361/201321863, S2CID 54177778, A124.
- ^ a b 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.
- ^ a b c 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.
- ^ a b 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.
- ^ a b c Earle Luck, R. (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137.
- ^ Lèbre, A.; et al. (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.
- ^ "63 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-18.
- ^ 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.