26 Cygni

Last updated
26 Cygni
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus
Right ascension 20h 01m 21.56485s [1]
Declination +50° 06′ 16.8912″ [1]
Apparent magnitude  (V)5.12 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type G8 III [4]
B−V color index 1.122 [5]
Astrometry
Radial velocity (Rv)−0.25±0.16 [1] km/s
Proper motion (μ)RA: +15.520 [1] mas/yr
Dec.: +5.805 [1] mas/yr
Parallax (π)7.2271±0.0853  mas [1]
Distance 451 ± 5  ly
(138 ± 2  pc)
Absolute magnitude  (MV)−0.56 [6]
Details
Mass 2.44 [3]   M☉
Radius 22.27 [3]   R☉
Luminosity 204.8 [3]   L☉
Surface gravity (log g)2.50 [5]   cgs
Temperature 4,700 [5]   K
Metallicity [Fe/H]−0.09±0.04 [6]   dex
Rotational velocity (v sin i)3.63 [5]  km/s
Other designations
e Cyg, 26 Cyg, BD+49°3158, HD 190147, HIP 98571, HR 7660, SAO 49098, ADS 13278, WDS J20014+5006, 2MASS J20012157+5006167 [7]
Database references
SIMBAD data

26 Cygni is a single [8] star in the northern constellation of Cygnus. It has the Bayer designation e Cygni, while 26 Cygni is the Flamsteed designation. This star is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 5.12. [2] It is located around 451 light-years (138 pc) distant from the Sun, [1] based on parallax measurements. The radial velocity is close to negligible, being measured at −0.3 km/s. [1]

This object is an evolved giant star with a stellar classification of G8 III; [4] a star that has used up its core hydrogen and left the main sequence. It is most likely (88% chance) on the horizontal branch, in which case stellar modelling yields an estimated 2.44 times the mass of the Sun and 22 times the Sun's radius. [3] It is radiating 205 times the luminosity of the Sun from its enlarged photosphere [3] at an effective temperature of 4,700 K. [5]

There is a magnitude 8.94 visual companion at an angular separation of 41.6″ along a position angle of 150°, as of 2014. [9]

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52: 7. Bibcode:1983ApJS...52....7F. doi: 10.1086/190856 .
  3. 1 2 3 4 5 6 Stock, Stephan; et al. (August 2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy & Astrophysics. 616: 15. arXiv: 1805.04094 . Bibcode:2018A&A...616A..33S. doi:10.1051/0004-6361/201833111. S2CID   119361866. A33.
  4. 1 2 Abt, Helmut A. (2008). "Visual Multiples. IX. MK Spectral Types". The Astrophysical Journal Supplement Series. 176 (1): 216–217. Bibcode:2008ApJS..176..216A. doi: 10.1086/525529 .
  5. 1 2 3 4 5 Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003. arXiv: 0709.1145 . Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233. S2CID   10436552.
  6. 1 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, S2CID   119257644.
  7. ↑ "26 Cyg". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-01-11.
  8. ↑ 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.
  9. ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi: 10.1086/323920 , retrieved 2015-07-22
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