Nu Aurigae

Nu Aurigae, Latinized from ν Aurigae, is the Bayer designation for a star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 3.96[2] and is approximately 220 light-years (67 parsecs) distant from the Earth. This is an evolved giant star with a stellar classification of G9.5 III.[8] It is a red clump star, which indicates that it is generating energy through the fusion of helium at its core.[9] The outer envelope has expanded to 19 times the radius of the Sun and cooled to 4,571 K,[4] giving it the characteristic yellow-hued glow of a G-type star. It shines with 135 times the luminosity of the Sun.[4]

ν Aurigae
Location of ν Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 51m 29.40040s[1]
Declination +39° 08′ 54.5428″[1]
Apparent magnitude (V) 3.957[2]
Characteristics
Spectral type G9.5 III Fe1 Ba0.2 + wd[3]
U−B color index +1.084[2]
B−V color index +1.138[2]
R−I color index 0.56
Astrometry
Radial velocity (Rv)+9.92 ± 0.14[4] km/s
Proper motion (μ) RA: +8.48[1] mas/yr
Dec.: +0.39[1] mas/yr
Parallax (π)15.17 ± 0.88[1] mas
Distance220 ± 10 ly
(66 ± 4 pc)
Absolute magnitude (MV)−0.27[5]
Details
Mass2.12[6] M☉
Radius19[4] R☉
Luminosity135[4] L☉
Surface gravity (log g)2.4[4] cgs
Temperature4,571[4] K
Metallicity [Fe/H]–0.14[4] dex
Rotational velocity (v sin i)5.0[4] km/s
Age1.11[6] Gyr
Other designations
ν Aur, 32 Aurigae, ADS 4440, BD+39 1429, FK5 221, HD 39003, HIP 27673, HR 2012, SAO 58502.[7]
Database references
SIMBADdata

This is an astrometric binary with a suspected white dwarf companion.[3] A 10th magnitude star 54.6 arcseconds away is an optical companion.

References
  1. van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311.
  2. Oja, T. (August 1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series, 65 (2): 405–409, Bibcode:1986A&AS...65..405O.
  3. 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.
  4. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  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.
  6. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  7. "* 32 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-19.
  8. Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
  9. Valentini, M.; Munari, U. (November 2010), "A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample", Astronomy and Astrophysics, 522: A79, arXiv:1007.0207, Bibcode:2010A&A...522A..79V, doi:10.1051/0004-6361/201014870.
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