Nu Aurigae, Latinised 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 200 light-years (61 parsecs) distant from the Earth.[1] This is an evolved giant star with a stellar classification of G9.5 III.[9] It is a red clump star, which indicates that it is generating energy through the fusion of helium at its core.[10] The outer envelope has expanded to 18 times the radius of the Sun and cooled to 4,576 K,[7] giving it the characteristic yellow-hued glow of a G-type star.[11] It shines with 126 times the luminosity of the Sun.[7]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 51m 29.36946s[1] |
| Declination | +39° 08′ 54.6861″[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: +7.958 mas/yr[1] Dec.: +0.713 mas/yr[1] |
| Parallax (π) | 16.1414 ± 0.4427 mas[1] |
| Distance | 202 ± 6 ly (62 ± 2 pc) |
| Absolute magnitude (MV) | −0.27[5] |
| Details | |
| Mass | 2.12[6] M☉ |
| Radius | 17.85+0.51 −0.53[7] R☉ |
| Luminosity | 126±8[7] L☉ |
| Surface gravity (log g) | 2.4[4] cgs |
| Temperature | 4,576±50[7] K |
| Metallicity [Fe/H] | –0.14[4] dex |
| Rotational velocity (v sin i) | 5.0[4] km/s |
| Age | 1.11[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an astrometric binary with a suspected white dwarf companion.[3] A 10th-magnitude star 54.6 arcseconds away is an optical companion.
See also
editReferences
edit- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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.
- ^ a b 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.
- ^ a b c d 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.
- ^ 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.
- ^ a b 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, S2CID 118505114.
- ^ a b c d e Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; Van Belle, Gerard T. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431.
- ^ "* 32 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-19.
- ^ 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.
- ^ 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, S2CID 119156545.[permanent dead link]
- ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on December 3, 2013. Retrieved 2012-01-16.