63 Cygni

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]

This article is about f2 Cygni. For other stars with this Bayer designation, see f Cygni.
63 Cygni
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]
Distanceapprox. 1,200 ly
(approx. 380 pc)
Absolute magnitude (MV)−2.93[5]
Details
Radius138[1] R☉
Luminosity3,981 - 4,130[1] L☉
Surface gravity (log g)1.27[6] cgs
Temperature3,927[1] K
Metallicity [Fe/H]0.12[6] dex
Rotational velocity (v sin i)6.3[7] km/s
Other designations
f2 Cyg, 63 Cyg, BD+47°3292, FK5 3688, HD 201251, HIP 104194, HR 8089, SAO 50456, WDS J21066+4739[8]
Database references
SIMBADdata

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
  1. 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.
  2. 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.
  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. 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.
  5. 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.
  6. 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.
  7. 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.
  8. "63 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-18.
  9. 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.
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