Omicron Tauri
  | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 24m 48.79832s |
| Declination | +09° 01′ 43.9306″ |
| Apparent magnitude (V) | 3.61 |
| Characteristics | |
| Spectral type | G6 III |
| B−V color index | +0.887±0.019 |
| Astrometry | |
| Radial velocity (Rv) | −19.79±0.06 km/s |
| Proper motion (μ) | RA: −67.04 mas/yr Dec.: −78.04 mas/yr |
| Parallax (π) | 12.11±0.87 mas |
| Distance | 270 ± 20 ly (83 ± 6 pc) |
| Absolute magnitude (MV) | −1.23 |
| Orbit | |
| Period (P) | 1,653.49±0.41 days |
| Semi-major axis (a) | 4.037±0.021 au |
| Eccentricity (e) | 0.2966±0.0014 |
| Periastron epoch (T) | 51,288.6±1.2 |
| Argument of periastron (ω) (secondary) | 145.18±0.08° |
| Semi-amplitude (K1) (primary) | 4.4172±0.0071 km/s |
| Details | |
| ο Tauri A | |
| Mass | 3.21±0.12 M☉ |
| Radius | 20.28±3.66 R☉ |
| Luminosity | 302 L☉ |
| Surface gravity (log g) | 2.43±0.06 cgs |
| Temperature | 5,094±15 K |
| Metallicity [Fe/H] | −0.13±0.02 dex |
| Rotational velocity (v sin i) | 3.29±0.61 km/s |
| Age | 324+39 −35 Myr |
| ο Tauri B | |
| Mass | ≥0.568±0.015 M☉ |
| Other designations | |
| ο Tau, 1 Tauri, BD+08°511, FK5 121, HD 21120, HIP 15900, HR 1030, SAO 111172 | |
| Database references | |
| SIMBAD | data |
ο Tauri, Latinized as Omicron Tauri, is a binary star system in the constellation Taurus, near the constellation border with Cetus. It has a yellow hue and is visible to the naked eye with an apparent visual magnitude of 3.61. It is approximately 270 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −20 km/s. As the westernmost bright point of light in Taurus, this system has the Flamsteed designation 1 Tauri; Omicron Tauri is the Bayer designation.
This is a single-lined spectroscopic binary system with the two components orbiting each other over a period of 4.5270 years with an eccentricity of 0.2966. The primary component, ο Tau A, is an aging G-type giant with a stellar classification of G6 III. This star has three times the mass of the Sun and 18 to 20 times the Sun's radius. Based on the former, interferometry-measured radius, it is rotating once every 533 days. It is radiating 302 times the luminosity of the Sun from its photosphere at an effective temperature of 5,094 K. The secondary component, ο Tau B, has a minimum mass of 0.568 solar masses.
References
- 1 2 3 4 "omi Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-10.
- 1 2 3 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.
- 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- 1 2 3 4 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. S2CID 18759600. Omicron Tauri's database entry at VizieR.
- 1 2 3 4 Deka-Szymankiewicz, B.; Niedzielski, A.; Adamczyk, M.; Adamów, M.; Nowak, G.; Wolszczan, A. (2018-07-01). "The Penn State - Toruń Centre for Astronomy Planet Search stars. IV. Dwarfs and the complete sample". Astronomy and Astrophysics. 615: A31. arXiv:1801.02899. Bibcode:2018A&A...615A..31D. doi:10.1051/0004-6361/201731696. ISSN 0004-6361. Omicron Tauri's database entry at VizieR.
- 1 2 3 4 Jaros, R.; Niedzielski, A.; Ali, S.; Srivastava, D.; Sierzputowska, J.; Adamów, M.; Lillo-Box, J.; Orikhovskyi, D.; Wolszczan, A.; Villaver, E.; Pribulla, T.; Vaňko, M. (October 2026). "Joint Observations of PTPS Targets (JOTA). Combined spectroscopic and photometric analysis of 16 SB1 systems". Astronomy & Astrophysics. 714: A163. doi:10.1051/0004-6361/202660637. ISSN 0004-6361.
- 1 2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. Omicron Tauri's database entry at VizieR.
- ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- 1 2 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
External links
- Kaler, James B. (March 20, 2009), "Omicron Tauri", STARS, retrieved 2019-10-10.
