| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 02h 12m 22.28003s [1] |
| Declination | +30° 18′ 11.0430″ [1] |
| Apparent magnitude (V) | +5.51 [2] |
| Characteristics | |
| Spectral type | K2 III [2] |
| B−V color index | 1.077 [2] |
| Astrometry | |
| Radial velocity (Rv) | +24.75±0.02 [2] km/s |
| Proper motion (μ) |
RA: −65.05
[1]
mas/
yr Dec.: −60.50 [1] mas/ yr |
| Parallax (π) | 11.22 ± 0.70 mas [1] |
| Distance | 290 ± 20
ly (89 ± 6 pc) |
| Absolute magnitude (MV) | +0.76 [2] |
| Details | |
| Mass | 1.53 [3] M☉ |
| Radius | 12 [4] R☉ |
| Luminosity | 57.5 [3] L☉ |
| Surface gravity (log g) | 2.5 [5] cgs |
| Temperature | 4,737±77 [3] K |
| Metallicity [Fe/H] | 0.12 [5] dex |
| Rotational velocity (v sin i) | 4.6 [4] km/s |
| Age | 4.21 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega1 Tauri is a solitary, [7] orange hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.51. [2] Based upon an annual parallax shift of 11.22 mas as seen from Earth, [1] it is located about 290 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K2 III. [2] At the estimated age of 4.2 billion years, [3] it is a red clump star that is generating energy by helium fusion at its core. [5] Omega1 Tauri has about 1.5 [3] times the mass of the Sun and has expanded to around 12 [4] times the Sun's radius. It is radiating 57.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,737 K. [3] The radial velocity of this star shows no appreciable variation, and for this reason it is used as a radial velocity standard. [2]
- ^ a b c d e f 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.
- ^ a b c d e f g h Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv: astro-ph/0604502, Bibcode: 2006A&A...454..943H, doi: 10.1051/0004-6361:20064946, S2CID 119529768.
- ^ a b c d e f g 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 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.
- ^ a b c Tautvaišienė, G.; et al. (March 2013), "Red clump stars of the Milky Way - laboratories of extra-mixing", Monthly Notices of the Royal Astronomical Society, 430 (1): 621−627, arXiv: 1304.4393, Bibcode: 2013MNRAS.430..621T, doi: 10.1093/mnras/sts663, S2CID 119211439.
- ^ "ome01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30.
- ^ 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.
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 02h 12m 22.28003s [1] |
| Declination | +30° 18′ 11.0430″ [1] |
| Apparent magnitude (V) | +5.51 [2] |
| Characteristics | |
| Spectral type | K2 III [2] |
| B−V color index | 1.077 [2] |
| Astrometry | |
| Radial velocity (Rv) | +24.75±0.02 [2] km/s |
| Proper motion (μ) |
RA: −65.05
[1]
mas/
yr Dec.: −60.50 [1] mas/ yr |
| Parallax (π) | 11.22 ± 0.70 mas [1] |
| Distance | 290 ± 20
ly (89 ± 6 pc) |
| Absolute magnitude (MV) | +0.76 [2] |
| Details | |
| Mass | 1.53 [3] M☉ |
| Radius | 12 [4] R☉ |
| Luminosity | 57.5 [3] L☉ |
| Surface gravity (log g) | 2.5 [5] cgs |
| Temperature | 4,737±77 [3] K |
| Metallicity [Fe/H] | 0.12 [5] dex |
| Rotational velocity (v sin i) | 4.6 [4] km/s |
| Age | 4.21 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega1 Tauri is a solitary, [7] orange hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.51. [2] Based upon an annual parallax shift of 11.22 mas as seen from Earth, [1] it is located about 290 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K2 III. [2] At the estimated age of 4.2 billion years, [3] it is a red clump star that is generating energy by helium fusion at its core. [5] Omega1 Tauri has about 1.5 [3] times the mass of the Sun and has expanded to around 12 [4] times the Sun's radius. It is radiating 57.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,737 K. [3] The radial velocity of this star shows no appreciable variation, and for this reason it is used as a radial velocity standard. [2]
- ^ a b c d e f 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.
- ^ a b c d e f g h Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv: astro-ph/0604502, Bibcode: 2006A&A...454..943H, doi: 10.1051/0004-6361:20064946, S2CID 119529768.
- ^ a b c d e f g 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 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.
- ^ a b c Tautvaišienė, G.; et al. (March 2013), "Red clump stars of the Milky Way - laboratories of extra-mixing", Monthly Notices of the Royal Astronomical Society, 430 (1): 621−627, arXiv: 1304.4393, Bibcode: 2013MNRAS.430..621T, doi: 10.1093/mnras/sts663, S2CID 119211439.
- ^ "ome01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30.
- ^ 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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