Astronomy:Nu Aurigae

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Short description: Variable star in the constellation Auriga
ν Aurigae
Location of ν Aurigae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga[1]
Right ascension  05h 51m 29.36946s[2]
Declination +39° 08′ 54.6861″[2]
Apparent magnitude (V) 3.957[3]
Characteristics
Evolutionary stage red clump[4]
Spectral type G9.5 III Fe1 Ba0.2 + wd[5]
U−B color index +1.084[3]
B−V color index +1.138[3]
R−I color index 0.56
Astrometry
Radial velocity (Rv)+9.92±0.14[6] km/s
Proper motion (μ) RA: +7.958[2] mas/yr
Dec.: +0.713[2] mas/yr
Parallax (π)16.1414 ± 0.4427[2] mas
Distance202 ± 6 ly
(62 ± 2 pc)
Absolute magnitude (MV)−0.27[1]
Details
Mass2.12[7] M☉
Radius17.85+0.51
−0.53[8] R☉
Luminosity126±8[8] L☉
Surface gravity (log g)2.4[6] cgs
Temperature4,576±50[8] K
Metallicity [Fe/H]−0.14[6] dex
Rotational velocity (v sin i)5.0[6] km/s
Age1.11[7] Gyr
Other designations
ν Aur, 32 Aurigae, BD+39 1429, FK5 221, GC 7334, HD 39003, HIP 27673, HR 2012, SAO 58502, PPM 70925, ADS 4440, WDS J05515+3909A[9]
Database references
SIMBADdata

Nu Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinised from ν Aurigae, and abbreviated Nu Aur or ν Aur. This star is visible to the naked eye with an apparent visual magnitude of 3.96.[3] Based on parallax measurements, it is approximately 202 light-years (62 parsecs) distant from the Earth.[2] The star is drifting further away from the Sun with a radial velocity of +10 km/s.[6]

This is an evolved giant star with a stellar classification of G9.5 III.[10] At 1.1 billion years of age,[7] it is a red clump star that is generating energy through the fusion of helium at its core.[4] Its outer envelope has expanded to 18 times the radius of the Sun and cooled to 4,576 K,[8] giving it the characteristic yellow-hued glow of a G-type star.[11] It shines with 126 times the luminosity of the Sun[8] and has 2.12 times the Sun's mass.[7]

This is an astrometric binary with a suspected white dwarf companion.[5] Radial velocity variations suggest an orbital period of 20.18 ± 0.85 yr (7,370 ± 310 d) with a large eccentricity of 0.71.[12] A 10th-magnitude star 54.6 arcseconds away is an optical companion.

See also

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 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. 
  4. ↑ 4.0 4.1 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, doi:10.1051/0004-6361/201014870, Bibcode: 2010A&A...522A..79V, http://orbi.ulg.ac.be/jspui/handle/2268/142442. 
  5. ↑ 5.0 5.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  7. ↑ 7.0 7.1 7.2 7.3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Baines, Ellyn K. et al. (2021), "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 162 (5): 198, doi:10.3847/1538-3881/ac2431, Bibcode: 2021AJ....162..198B. 
  9. ↑ "* 32 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+32+Aur. 
  10. ↑ Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51: 79, Bibcode: 1962RGOB...51...79E. 
  11. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16. 
  12. ↑ Strassmeier, K. G. et al. (December 2020), "BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses⋆", Astronomy & Astrophysics 644: id. A104, doi:10.1051/0004-6361/202039310, Bibcode: 2020A&A...644A.104S. 

Coordinates: Sky map 05h 51m 29.4s, +39° 08′ 54.5″



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