8 Cygni

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8 Cygni
Observation data
Epoch J2000        Equinox J2000
Constellation Cygnus
Right ascension 19h 31m 46.32184s [1]
Declination +34° 27′ 10.6874″ [1]
Apparent magnitude  (V)4.75 [2]
Characteristics
Spectral type B3 IV [3]
B−V color index −0.155 [2]
Astrometry
Radial velocity (Rv)−21.20±0.1 [4] km/s
Proper motion (μ)RA: 1.16 [1] mas/yr
Dec.: −3.47 [1] mas/yr
Parallax (π)3.79±0.16  mas [1]
Distance 860 ± 40  ly
(260 ± 10  pc)
Details
Mass 6.40 [5]   M☉
Radius 6.50 [5]   R☉
Luminosity 2,512 [5]   L☉
Surface gravity (log g)3.62 [5]   cgs
Temperature 16,100 [5]   K
Metallicity [Fe/H]+0.25 [5]   dex
Rotational velocity (v sin i)15 [6]  km/s
Other designations
8  Cygni, BD+34°3590, HD  184171, HIP  96052, HR  7426, SAO  68447.
Database references
SIMBAD data

8 Cygni is a single [7] star in the northern constellation of Cygnus. Based upon its parallax of 3.79 mas, [1] it is approximately 860 light-years (260 parsecs) away from Earth. It is visible to the naked eye as a faint, bluish-white hued star with an apparent visual magnitude of about 4.7. [2] The star is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. [4]

This is an aging subgiant star, as indicated by its spectral type of B3IV. [3] Its effective temperature of 16,100 K fits into the normal range of B-type stars: 11,000 to 25,000 K. 8 Cygni is about twice as hot as the Sun, and it is six times larger and many times brighter in comparison. [5] The elemental abundances are near solar. [8]

References

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  3. 1 2 Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi: 10.1086/190179
  4. 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  5. 1 2 3 4 5 6 7 Challouf, M.; et al. (2014), "Improving the surface brightness-color relation for early-type stars using optical interferometry⋆", Astronomy & Astrophysics, 570: A104, arXiv: 1409.1351 , Bibcode:2014A&A...570A.104C, doi:10.1051/0004-6361/201423772, S2CID   14624307.
  6. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi: 10.1086/340590 .
  7. ↑ 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.
  8. ↑ Adelman, Saul J. (June 1998). "Elemental abundance analyses with DAO spectrograms - XIX. The superficially normal B stars zeta Draconis, epsilon Lyrae, 8 Cygni and 22 Cygni". Monthly Notices of the Royal Astronomical Society. 296 (4): 856–862. Bibcode:1998MNRAS.296..856A. doi: 10.1046/j.1365-8711.1998.01426.x .
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