Astronomy:Upsilon Aurigae
  | |
| Observation data Equinox J2000.0]] (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] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | +37.62±0.34[7] km/s |
| Proper motion (μ) | RA: +36.426[2] mas/yr Dec.: −45.606[2] mas/yr |
| Parallax (π) | 5.7358 ± 0.2055[2] mas |
| 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 | |
| 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
- ↑ 1.0 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.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 3.2 3.3 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
- ↑ 4.0 4.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 5.0 5.1 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, doi:10.1086/307311, Bibcode: 1999ApJ...518..859K.
- ↑ 6.0 6.1 Hamada, K. et al. (January 1979), "On the Variability of upsilon Aurigae", Information Bulletin on Variable Stars 1531: 1, Bibcode: 1979IBVS.1531....1H.
- ↑ 7.0 7.1 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, doi:10.1051/0004-6361/200810698, Bibcode: 2009A&A...498..627F.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Baines, E. et al. (2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B.
- ↑ 9.0 9.1 Anugu, Narsireddy; Monnier, John D.; Mérand, Antoine; Flores, Becky; Gallenne, Alexandre; Gies, Douglas R.; Gutierrez, Mayra; Klement, Robert et al. (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.
- ↑ 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, doi:10.1093/pasj/63.3.677, Bibcode: 2011PASJ...63..677T.
- ↑ "* ups Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+ups+Aur.
- ↑ 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.
External links
 |  |
