Nu Cygni

Nu Cygni, Latinized from ν Cygni, is a binary star[9] system in the constellation Cygnus. Its apparent magnitude is 3.94[2] and it is approximately 374 light years away based on parallax.[1] The brighter component is a magnitude 4.07 A-type giant star with a stellar classification of A0III n,[3] where the 'n' indicates broad "nebulous" absorption lines due to rapid rotation. This white-hued star has an estimated 3.6[6] times the mass of the Sun and about 1.9[7] times the Sun's radius. It is radiating 412[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,462 K.[6] The magnitude 6.4 companion has an angular separation of 0.24" from the primary.[9]

ν Cygni
Location of ν Cygni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 57m 10.41907s[1]
Declination 41° 10′ 01.6991″[1]
Apparent magnitude (V) 3.94 [2]
Characteristics
Spectral type A0III n[3]
U−B color index +0.00[2]
B−V color index +0.02[2]
Astrometry
Radial velocity (Rv)−27.60[4] km/s
Proper motion (μ) RA: +9.64[1] mas/yr
Dec.: −22.75[1] mas/yr
Parallax (π)8.71 ± 0.34 mas[1]
Distance370 ± 10 ly
(115 ± 4 pc)
Absolute magnitude (MV)−1.36[5]
Details
ν Cyg A
Mass3.62±0.08[6] M☉
Radius1.90[7] R☉
Luminosity412[6] L☉
Temperature9,462[6] K
Rotational velocity (v sin i)217[6] km/s
Other designations
ν Cyg, 58 Cyg, BD+40° 4364, GC 29251, HD 199629, HIP 103413, HR 8028, SAO 50274, WDS J20572+4110AB[8]
Database references
SIMBADdata

References
  1. van Leeuwen, F. (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. Vizier catalog entry
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
  3. Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. Vizier catalog entry
  4. Gontcharov, G. A. (November 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. 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. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  7. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754 Vizier catalog entry
  8. "* nu. Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 11 March 2017.
  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 Vizier catalog entry
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