υ Aurigae
Location of υ Aurigae (circled) |
Observation data
Epoch J2000 Equinox ICRS |
| Constellation |
Auriga[1] |
| Right ascension |
05h 51m 02.437s[2] |
| Declination |
+37° 18′ 20.05″[2] |
| Apparent magnitude (V) |
4.74[3] |
| Characteristics |
| Evolutionary stage |
Asymptotic giant branch[4] |
| Spectral type |
M0 III[5] |
| U−B color index |
+1.93[3] |
| B−V color index |
+1.62[3] |
| R−I color index |
1.07 |
| Variable type |
Suspected[6] |
| Astrometry |
|---|
| Radial velocity (Rv) | +37.62±0.34[7] km/s |
| Proper motion (μ) | RA: +36.426 mas/yr[2]
Dec.: −45.606 mas/yr[2] |
| Parallax (π) | 5.7358±0.2055 mas[2] |
| Distance | 570 ± 20 ly
(174 ± 6 pc) |
| Absolute magnitude (MV) | −1.28[1] |
| Details |
|---|
| Mass | 1.64±0.22[8] M☉ |
| Radius | 80.46±2.66[9] R☉ |
| Luminosity | 1,165±250[8] L☉ |
| Surface gravity (log g) | 1.16+0.04
−0.08[10] cgs |
| Temperature | 3,912±52[8] K |
| Age | 1.98±0.68[8] Gyr |
| Other designations |
|---|
| υ Aur, 31 Aurigae, NSV 2661, BD+37 1336, FK5 2440, GC 7322, HD 38944, HIP 27639, HR 2011, SAO 58496, PPM 70915[11] |
| Database references |
|---|
| SIMBAD | data |
Upsilon Aurigae is a single[12] star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinised from υ Aurigae, and abbreviated Upsilon Aur or υ Aur. This star has an apparent visual magnitude of 4.74,[3] which means it is bright enough to be seen with the naked eye. Based upon parallax measurements, this star is approximately 570 light-years (170 parsecs) distant from the Earth. It is drifting further away with a radial velocity of +37 km/s.[7]
This is an evolved red giant star with a stellar classification of M0 III.[5] It is a suspected variable star[6] and is currently on the asymptotic giant branch, which means it is generating energy through the fusion of helium along a shell surrounding a small, inert core of carbon and oxygen.[4] The star is two billion years old with 1.64 times the mass of the Sun[8] and has expanded to 80 times the Sun's radius.[9] It is radiating 1,165 times the Sun's luminosity from its photosphere at an effective temperature of 3,912 K.[8]
References
- 1 2 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.
XHIP record for this object at VizieR.
- 1 2 3 4 5 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.
- 1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
- 1 2 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
- 1 2 Keenan, Philip C.; Barnbaum, Cecilia (June 1999), "Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes", The Astrophysical Journal, 518 (2): 859–865, Bibcode:1999ApJ...518..859K, doi:10.1086/307311, S2CID 121902473.
- 1 2 Hamada, K.; et al. (January 1979), "On the Variability of upsilon Aurigae", Information Bulletin on Variable Stars, 1531: 1, Bibcode:1979IBVS.1531....1H.
- 1 2 Famaey, B.; et al. (May 2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698.
- 1 2 3 4 5 6 Baines, E.; et al. (2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1): 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
- 1 2 Anugu, Narsireddy; Monnier, John D.; Mérand, Antoine; Flores, Becky; Gallenne, Alexandre; Gies, Douglas R.; Gutierrez, Mayra; Klement, Robert; Kraus, Stefan (2026-07-27), "Empirical H- and K-band Limb Darkening for 31 CHARA Stars: A Near-Infrared Benchmark for Stellar-Atmosphere Models", The Astronomical Journal, arXiv:2607.24956.
- ↑ Takagi, Yuhei; et al. (June 2011), "Age Determinations of Early-M Type Pre-Main Sequence Stars Using a High-Resolution Near-Infrared Spectroscopic Method", Publications of the Astronomical Society of Japan, 63 (3): 677–684, Bibcode:2011PASJ...63..677T, doi:10.1093/pasj/63.3.677.
- ↑ "* ups Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-23.
- ↑ 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.
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