Omicron Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 24m 48.79796s[1] |
| Declination | +09° 01′ 43.9489″[1] |
| Apparent magnitude (V) | +4.875 ± 0.012[2] |
| Characteristics | |
| Spectral type | B2 V[2] |
| U−B color index | −0.768 ± 0.005[2] |
| B−V color index | −0.145 ± 0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | –21.0 km/s |
| Proper motion (μ) | RA: –67.04 ± 1.03[1] mas/yr Dec.: –78.04 ± 1.02[1] mas/yr |
| Parallax (π) | 11.21 ± 0.87[1] mas |
| Distance | 290 ± 20 ly (89 ± 7 pc) |
| Details | |
| Surface gravity (log g) | 4.15 ± 0.07[2] cgs |
| Temperature | 20,700 ± 200[2] K |
| Rotational velocity (v sin i) | 25 ± 2[2] km/s |
| Other designations | |
Omicron Tauri (ο Tau, ο Tauri) is a star in the constellation Taurus. Omicron Tauri is a yellow G-type giant with an apparent magnitude of +3.61. This star has three times the mass of the Sun and fifteen[3] to eighteen times the Sun's radius. Based on the latter, interferometry-measured radius, it is rotating once every 533 days.[4] It is approximately 212 light years from Earth and is radiating 155 times the luminosity of the Sun.[5]
This is a binary star system with the two components orbiting each other over a period of 1,655 days at an eccentricity of 0.263.[6]
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry - 1 2 3 4 5 6 7 Nieva, M.-F. (February 2013), "Temperature, gravity, and bolometric correction scales for non-supergiant OB stars", Astronomy & Astrophysics, 550: A26, arXiv:1212.0928, Bibcode:2013A&A...550A..26N, doi:10.1051/0004-6361/201219677.
- ↑ da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
- ↑ Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1
- ↑ Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
- ↑ Jackson, E. S.; Shane, W. W.; Lynds, Beverly T. (May 1957), "The Orbits of the Spectroscopic Binaries Omicron Tauri, Xi Cancri, and Mu Ursae Majories", Astrophysical Journal, 125: 712, Bibcode:1957ApJ...125..712J, doi:10.1086/146345
External links
- "HD 21120 -- Star in double system". SIMBAD Astronomical Database. Retrieved 2007-02-24.
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