Omega1 Tauri

Omega¹ Tauri
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Taurus
Right ascension	04h 07m 09.97s
Declination	+19° 36′ 33.2″
Apparent magnitude (V)	+5.51
Characteristics
Spectral type	K2 III
B−V color index	1.077
Astrometry
Radial velocity (Rv)	+24.75±0.02 km/s
Proper motion (μ)	RA: −65.05 mas/yr ; Dec.: −60.50 mas/yr
Parallax (π)	11.22±0.70 mas
Distance	290 ± 20 ly ; (89 ± 6 pc)
Absolute magnitude (MV)	+0.76
Details
Mass	1.53 M☉
Radius	12 R☉
Luminosity	57.5 L☉
Surface gravity (log g)	2.5 cgs
Temperature	4,737±77 K
Metallicity [Fe/H]	0.12 dex
Rotational velocity (v sin i)	4.6 km/s
Age	4.21 Gyr
Other designations
	ω1 Tau, 43 Tau, BD+19°672, FK5 1115, HD 26162, HIP 19388, HR 1283, SAO 93785
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]

References

^ ^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.

[vanLeeuwen2007-1] ^ ^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.

[Hekker2006-2] ^ ^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.

[Luck2015-3] ^ ^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.

[Massarotti2008-4] 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.

[Tautvaisiene2013-5] 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.

[SIMBAD-6] "ome01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30.

[Eggleton2008-7] 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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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Taurus
Right ascension	04^h 07^m 09.97^s^[1]
Declination	+19° 36′ 33.2″^[1]
Apparent magnitude (V)	+5.51^[2]
Characteristics
Spectral type	K2 III^[2]
B−V color index	1.077^[2]
Astrometry

Radial velocity (R_v)	+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 (M_V)	+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
ω¹ Tau, 43 Tau, BD+19°672, FK5 1115, HD 26162, HIP 19388, HR 1283, SAO 93785^[6]
Database references
SIMBAD	data

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