{{Short description|Star in the constellation Taurus}} {{DISPLAYTITLE:Omega<sup>1</sup> Tauri}} {{other stars by Bayer designation|Omega Tauri{{!}}ω Tauri}} {{Starbox begin | name = Omega<sup>1</sup> Tauri }} {{Starbox image | image = {{Location mark |image=Taurus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=Omega1 Tauri |x=670|y=455 }} | caption = Location of ω<sup>1</sup> Tauri (circled in red) }} {{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Taurus | ra = {{RA|04|07|09.97}}<ref name=vanLeeuwen2007/> | dec = {{DEC|+19|36|33.2}}<ref name=vanLeeuwen2007/> | appmag_v = +5.51<ref name=Hekker2006/> }} {{Starbox character | type = horizontal branch<ref name=stock2018/> | class = K2 III<ref name=Hekker2006/> | b-v = 1.077<ref name=Hekker2006/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|+24.75|0.02}}<ref name=Hekker2006/> | prop_mo_ra = −65.05<ref name=vanLeeuwen2007/> | prop_mo_dec = −60.50<ref name=vanLeeuwen2007/> | parallax = 11.22 | p_error = 0.70 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = +0.76<ref name=Hekker2006/> }} {{Starbox detail | source = | mass = 1.53<ref name=Luck2015/> | radius = 12<ref name=Massarotti2008/> | luminosity = 57.5<ref name=Luck2015/> | temperature = {{Val|4737|77|fmt=commas}}<ref name=Luck2015/> | gravity = 2.5<ref name=Tautvaisiene2013/> | metal_fe = 0.12<ref name=Tautvaisiene2013/> | rotational_velocity = 4.6<ref name=Massarotti2008/> | age_gyr = 4.21<ref name=Luck2015/> }} {{Starbox catalog | names = {{odlist | B=ω<sup>1</sup> Tau | F=43 Tau | BD=+19°672 | FK5=1115 | HD=26162 | HIP=19388 | HR=1283 | SAO=93785}}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = ome01+Tau }} {{Starbox end}} '''Omega<sup>1</sup> Tauri''' is a solitary,<ref name=Eggleton2008/> 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.<ref name=Hekker2006/> Based upon an annual parallax shift of 11.22 mas as seen from Earth,<ref name=vanLeeuwen2007/> 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.<ref name=Hekker2006/> At the estimated age of 4.2 billion years,<ref name=Luck2015/> it is a red clump star that is generating energy by helium fusion at its core.<ref name=Tautvaisiene2013/> Omega<sup>1</sup> Tauri has about 1.5<ref name=Luck2015/> times the mass of the Sun and has expanded to around 12<ref name=Massarotti2008/> 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.<ref name=Luck2015/> The radial velocity of this star shows no appreciable variation, and for this reason it is used as a radial velocity standard.<ref name=Hekker2006/>
==References== {{reflist|30em|refs=
<ref name=vanLeeuwen2007>{{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>
<ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | bibcode=2008MNRAS.389..869E | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
<ref name=Massarotti2008>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity | journal=The Astronomical Journal | postscript=. | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}</ref>
<ref name=Luck2015>{{citation | title=Abundances in the Local Region. I. G and K Giants | last1=Luck | first1=R. Earle | journal=Astronomical Journal | postscript=. | volume=150 | issue=3 | at=88 | year=2015 | bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 |arxiv = 1507.01466 | s2cid=118505114 }}</ref>
<ref name=Tautvaisiene2013>{{citation | postscript=. | title=Red clump stars of the Milky Way - laboratories of extra-mixing | display-authors=1 | last1=Tautvaišienė | first1=G. | last2=Barisevičius | first2=G. | last3=Chorniy | first3=Y. | last4=Ilyin | first4=I. | last5=Puzeras | first5=E. | journal=Monthly Notices of the Royal Astronomical Society | volume=430 | issue=1 | pages=621−627 | date=March 2013 | doi=10.1093/mnras/sts663 | doi-access=free | bibcode=2013MNRAS.430..621T |arxiv = 1304.4393 | s2cid=119211439 }}</ref>
<ref name=Hekker2006>{{citation | display-authors=1 | last1=Hekker | first1=S. | last2=Reffert | first2=S. | last3=Quirrenbach | first3=A. | last4=Mitchell | first4=D. S. | last5=Fischer | first5=D. A. | last6=Marcy | first6=G. W. | last7=Butler | first7=R. P. | title=Precise radial velocities of giant stars. I. Stable stars | journal=Astronomy and Astrophysics | volume=454 | issue=3 | pages=943–949 | date=August 2006 | doi=10.1051/0004-6361:20064946 | bibcode=2006A&A...454..943H | arxiv=astro-ph/0604502 | s2cid=119529768 | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=ome01 Tau | access-date=2017-06-30 }}</ref>
<ref name=stock2018>{{cite journal |last1=Stock |first1=Stephan |last2=Reffert |first2=Sabine |last3=Quirrenbach |first3=Andreas |title=Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search |journal=Astronomy and Astrophysics |date=2018 |volume=616 |pages=A33 |doi=10.1051/0004-6361/201833111 |arxiv=1805.04094 |bibcode=2018A&A...616A..33S }}</ref>
}}
{{Stars of Taurus|state=collapsed}}
Category:K-type giants Category:Horizontal-branch stars Tauri, Omega Category:Taurus (constellation) BD+19 0672 Tauri, 43 026162 019388 1283