Mu Cygni

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Mu Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 21h 44m 08.57793s[1]
Declination 28° 44′ 33.4731″[1]
Apparent magnitude (V) 4.50[2]
Characteristics
Spectral type F6V + G2V[3]
B−V color index +0.47[2]
Astrometry
Radial velocity (Rv) +16.95[4] km/s
Proper motion (μ) RA: +260.72[2] mas/yr
Dec.: -243.21[2] mas/yr
Parallax (π) 44.97 ± 0.43[1] mas
Distance 72.5 ± 0.7 ly
(22.2 ± 0.2 pc)
μ1 Cyg
Absolute bolometric
magnitude
 (Mbol)
2.91 ± 0.06[5]
μ2 Cyg
Absolute bolometric
magnitude
 (Mbol)
4.32 ± 0.06[5]
Details[5]
μ1 Cyg
Mass 1.35 M
Radius 1.88 ± 0.07 R
Surface gravity (log g) 4.05 ± 0.10 cgs
Temperature 6350 ± 80 K
Metallicity [Fe/H] −0.18 ± 0.07 dex
Rotational velocity (v sin i) 9.6 ± 0.8 km/s
μ2 Cyg
Mass 1.02 M
Radius 1.08 ± 0.05 R
Surface gravity (log g) 4.30 ± 0.10 cgs
Temperature 6055 ± 100 K
Rotational velocity (v sin i) 2.5 ± 1.0 km/s
Other designations
78 Cyg, BD+28° 4169, HIP 107310, CCDM J21442+2845AB, WDS J21441+2845AB[2]
μ1 Cyg: HD 206826, HR 8309, SAO 89940[6]
μ2 Cyg: HD 206827, HR 8310, SAO 89939[7]
Database references
SIMBAD μ Cyg
μ1 Cyg
μ2 Cyg

μ Cygni (Latinised as Mu Cygni) is a binary star[8] in the constellation Cygnus. Located around 22.24 parsecs (72.5 ly) distant, the system has a combined apparent magnitude of 4.50.[2] The primary, with an apparent magnitude of 4.69, has a spectral type of F6V,[6] and the secondary, with an apparent magnitude of 6.12, has a spectral type of G2V.[7] Their orbit has a period of around 700 years, with a semimajor axis of 5" and an eccentricity around 0.6.[9] Two reported additional components, C (apparent magnitude 12.93) and D (type A5 and apparent magnitude 6.94), are believed to be optical doubles rather than part of the Mu Cygni system.[3]

References[edit]

  1. ^ a b c van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e f "CCDM J21442+2845AB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-08. 
  3. ^ a b Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920  Vizier catalog entry
  4. ^ Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, Bibcode:2010A&A...521A..12M, arXiv:1007.1132Freely accessible, doi:10.1051/0004-6361/201014948 
  5. ^ a b c Fuhrmann, Klaus (2011). "Nearby stars of the Galactic disc and halo - V". Monthly Notices of the Royal Astronomical Society. 414 (4): 2893. Bibcode:2011MNRAS.414.2893F. doi:10.1111/j.1365-2966.2011.18476.x. 
  6. ^ a b "HR 8309". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 January 2014. 
  7. ^ a b "HR 8310". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 January 2014. 
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x.  Vizier catalog entry
  9. ^ Malkov, O. Yu.; et al. (October 2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546 (A69): A69, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774  Vizier catalog entry