{{short description|Star in the constellation of Taurus}}{{distinguish|Y Tauri}} {{Starbox begin | name = υ Tauri }} {{Starbox image | image= {{Location mark |image=Taurus constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=υ Tauri |x=560|y=368 }} |caption=Location of υ Tauri (circled) }} {{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Taurus<ref name=Anderson2012/> | ra = {{RA|04|26|18.46368}}<ref name=vanLeeuwen2007/> | dec = {{DEC|+22|48|48.8885}}<ref name=vanLeeuwen2007/> | appmag_v = 4.28{{snd}}4.31<ref name=gcvs/> }} {{Starbox character | type = main sequence<ref name=zorec2012/> | class = A8 Vn<ref name=Royer2007/> | b-v = +0.25<ref name=Danziger1967/> | u-b = +0.14<ref name=Danziger1967/> | variable = δ Scuti<ref name=gcvs/> }} {{Starbox astrometry | radial_v = {{Val|32.2|1.1}}<ref name=deBruijne2012/> | prop_mo_ra = +108.81<ref name=vanLeeuwen2007/> | prop_mo_dec = −46.80<ref name=vanLeeuwen2007/> | parallax = 21.21 | p_error = 0.25 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = +0.91<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = 1.55<ref name=David2015/> | radius = 1.803<ref name=vanSaders2013/> | luminosity = 32.5<ref name=Mcdonald2012/> | temperature = {{Val|7398|252|fmt=commas}}<ref name=David2015/> | gravity = 3.50<ref name=David2015/> | metal_fe = | rotational_velocity = 243<ref name=Royer2007/> | rotation=0.415 d<ref name=vanSaders2013/> | age_myr = 827<ref name=David2015/> }} {{Starbox catalog | names = {{odlist | B=υ Tau, υ<sup>1</sup> Tau | F=69 Tauri | BD=+22 696 | FK5=2326 | HD=28024 | HIP=20711 | HR=1392 | SAO=76608 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = ups+Tau }} {{Starbox end}} '''Upsilon Tauri''' ('''υ Tauri''') is a solitary,<ref name=Eggleton2008/> white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster.<ref name=vanSaders2013/> It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.
==Properties== [[File:UpsilonTauLightCurve.png|thumb|left|A light curve for Upsilon Tauri, plotted from ''TESS'' data<ref name=MAST/>]] This is an A-type main sequence star with a stellar classification of A8 Vn.<ref name=Royer2007/> It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours.<ref name=gcvs/> At an estimated age of 827 million years,<ref name=David2015/> it is spinning rapidly with a rotation period of just 0.415 days.<ref name=vanSaders2013/> This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius.<ref name=vanBelle2012/>
Occasionally this star system shares the Bayer designation ''υ Tauri'' with 72 Tauri, which is separated from it by 0.29° in the sky.<ref name=hr/>
==Naming== With φ, κ<sup>1</sup>, κ<sup>2</sup> and χ, it composed the Arabic were the Arabs' ''Al Kalbain'', the Two Dogs.<ref name="allen1899"/> According to the catalogue of stars in the ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars'', ''Al Kalbain'' were the title for five stars : φ as ''Alkalbain I'', χ as ''Alkalbain II'', κ<sup>1</sup> as ''Alkalbain III'', κ<sup>2</sup> as ''Alkalbain IV'' and this star (υ) as ''Alkalbain V''.<ref name=rhoads1971/>
==References== <references> <ref name=gcvs>{{citation | postscript=. | display-authors=1 | last1=Samus | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | title=General Catalogue of Variable Stars | version=5.1 | journal=Astronomy Reports | year=2017 | volume=61 | issue=1 | pages=80–88 | bibcode=2017ARep...61...80S | s2cid=125853869 | doi=10.1134/S1063772917010085 }}</ref>
<ref name=hr>{{citation |postscript=. |last1=Hoffleit |first1=D. |last2=Jaschek |first2=C. |year=1991 |title=The Bright Star Catalogue |location=New Haven |publisher=Yale University Observatory |bibcode=1991bsc..book.....H}}</ref>
<ref name=MAST>{{citation |postscript=. | title=MAST: Barbara A. Mikulski Archive for Space Telescopes | url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html | publisher=Space Telescope Science Institute |access-date=8 December 2021}}</ref>
<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=Anderson2012>{{cite XHIP|20711}}</ref>
<ref name=Mcdonald2012>{{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | year=2012 | postscript=. | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 }}</ref>
<ref name=vanBelle2012>{{citation | last1=van Belle | first1=Gerard T. | title=Interferometric observations of rapidly rotating stars | journal=The Astronomy and Astrophysics Review | volume=20 | issue=1 | page=51 | date=March 2012 | doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V | postscript=. | arxiv=1204.2572 | s2cid=119273474 }}</ref>
<ref name=deBruijne2012>{{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>
<ref name=vanSaders2013>{{citation | title=Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic | last1=van Saders | first1=Jennifer L. | last2=Pinsonneault | first2=Marc H. | journal=The Astrophysical Journal | postscript=. | volume=776 | issue=2 | id=67 | pages=20 | date=October 2013 | doi=10.1088/0004-637X/776/2/67 | bibcode=2013ApJ...776...67V |arxiv = 1306.3701 | s2cid=119097746 }}</ref>
<ref name=David2015>{{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | s2cid=33401607 | 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=Royer2007>{{citation | display-authors=1 | last1=Royer | first1=F. | last2=Zorec | first2=J. | last3=Gómez | first3=A. E. | title=Rotational velocities of A-type stars. III. Velocity distributions | journal=Astronomy and Astrophysics | volume=463 | issue=2 | pages=671–682 | date=February 2007 | doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R | arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}</ref>
<ref name=Danziger1967>{{citation | last1=Danziger | first1=I. J. | last2=Dickens | first2=R. J. | title=Spectrophotometry of New Short-Period Variable Stars | journal=Astrophysical Journal | postscript=. | volume=149 | page=55 | date=July 1967 | doi=10.1086/149231 | bibcode=1967ApJ...149...55D | doi-access=free }}</ref> <!-- <ref name=Solano1997>{{citation | title=Spectroscopic survey of delta Scuti stars. I. Rotation velocities and effective temperatures | last1=Solano | first1=E. | last2=Fernley | first2=J. | journal=Astronomy & Astrophysics Supplement Series | postscript=. | volume=122 | pages=131–147 | date=April 1997 | doi=10.1051/aas:1997329 | bibcode=1997A&AS..122..131S | doi-access=free }}</ref> --> <ref name=SIMBAD>{{cite simbad | title=ups Tau | access-date=2017-08-05 | mode=cs2 | postscript=. }}</ref>
<ref name="allen1899">{{citation | title=Star-Names and Their Meanings | last=Allen | first=Richard Hinckley | author-link=Richard Hinckley Allen | date=1899 | publisher=G. E. Stechert | location=New York | page=413 }}</ref>
<ref name=rhoads1971>{{citation | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf | first1=Jack W. | last1=Rhoads | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars | publisher=Jet Propulsion Laboratory, California Institute of Technology | date=November 15, 1971 | postscript=. }}</ref>
<ref name=zorec2012>{{cite journal |last1=Zorec |first1=J. |last2=Royer |first2=F. |title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities |journal=Astronomy and Astrophysics |date=2012 |volume=537 |pages=A120 |doi=10.1051/0004-6361/201117691 |arxiv=1201.2052 |bibcode=2012A&A...537A.120Z }}</ref>
</references>
{{Stars of Taurus|state=collapsed}}
Category:Delta Scuti variables Category:A-type main-sequence stars Category:Hyades (star cluster) Tauri, Upsilon Category:Taurus (constellation) Category:Durchmusterung objects Tauri, 069 020711 028024 1392