# UX Tauri

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> Source: https://en.wikipedia.org/wiki/UX_Tauri
> Source revision: 1351413289
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{{Short description|Binary star system  in the constellation Taurus}}
{{Starbox begin 
| name = UX Tauri
}}
{{Starbox image
 |image=250px
 |caption=An artist's conception of a circumstellar disk around UX Tauri A, along with several hypothetical protoplanets
}}
{{Starbox observe
| epoch = [J2000.0](/source/J2000.0)
| constell = [Taurus](/source/Taurus_(constellation))<ref>{{cite constellation|UX Tauri}}</ref>
| ra = {{RA|04|30|03.99626}}<ref name="van Leeuwen2007">{{cite journal |title=Validation of the new Hipparcos reduction |last=van Leeuwen |first=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 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=14774 Vizier catalog entry ] {{Webarchive|url=https://web.archive.org/web/20190402114112/https://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%26A...474..653VFUL |date=2019-04-02 }}</ref>
| dec = {{DEC|+18|13|49.4355}}<ref name="van Leeuwen2007"/>
| appmag_v = 10.5 - 13.9<ref name=vsx>{{cite web |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=35054 |title=UX Tau |website=International Variable Star Index |access-date=2025-04-30 }}</ref>
}}
{{Starbox character 
| class = K2Ve + M1Ve<ref>{{cite journal |last=Herbig |first=G. H. |date=1977 |title=Radial velocities and spectral types of T Tauri stars |journal=Astrophysical Journal |volume=214 |pages=747–758 |bibcode=1977ApJ...214..747H |doi=10.1086/155304 |doi-access=free }}</ref>
| variable = [T Tau](/source/T_Tauri_variable)<ref name=gcvs>{{cite journal |bibcode=2017ARep...61...80S |title=General catalogue of variable stars: Version GCVS 5.1 |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. |journal=Astronomy Reports |date=2017 |volume=61 |issue=1 |page=80 |doi=10.1134/S1063772917010085 }}</ref>
}}
{{Starbox astrometry 
| radial_v=22.90<ref name=RV>{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|last=Gontcharov |first=G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}</ref>
| prop_mo_ra=17.18
| prop_mo_dec=-21.91
| pm_footnote = <ref name="van Leeuwen2007"/>
| parallax = -3.70
| p_error = 5.73
| parallax_footnote = <ref name="van Leeuwen2007"/>
| dist_ly = {{Convert|139.4|±|2.0|pc|ly|disp=number}}
| dist_pc = {{val|139.4|2.0}}<ref name=Mendigutia2026/>
| dist_footnote = 
}}
{{Starbox detail
| source = 
| component1 = UX Tauri A
| mass = {{Val|2.34|0.29|0.43}}<ref name=Mendigutia2026/>
| radius = {{solar radius calculator|type=logLT|0.95|5490|decimals=1}}<ref name=Mendigutia2026/>{{Efn|name=radius1|1=Calculated, using the [Stefan-Boltzmann law](/source/Stefan-Boltzmann_law) and the star's [effective temperature](/source/effective_temperature) and luminosity, with respect to the [solar](/source/Sun) nominal effective temperature of {{val|fmt=commas|5,772|ul=K}}:<math display="block">\sqrt{\biggl(\frac{5,772}{5,490}\biggr)^4 \cdot 10^{0.95}} = 3.3\ R_\odot.</math>}}
| temperature = {{Val|5490|130|210|fmt=commas}}<ref name=Mendigutia2026/>
| luminosity = {{Val|8.9|3.7|2.5}}<ref name=Mendigutia2026/>
| gravity = {{Val|3.77|0.17}}<ref name=Mendigutia2026/>
| metal_fe = {{val|+0.02|0.02}}<ref name=Mendigutia2026/>
| rotation = {{val|5.0|0.9}}<ref name=Mendigutia2026/> days
| rotational_velocity = {{Val|128|12}}<ref name=Mendigutia2026/>
| age_myr = {{Val|1.26|1.03|0.63}}<ref name=Mendigutia2026/>
| component2 = UX Tauri B
| mass2 = 0.4<ref name=Magazzu1991>{{cite journal|last=Magazzu |first=A. |date=1991|title=Lithium in the pre-main sequence triple system UX Tauri|journal=Astronomy and Astrophysics|volume=249|number=1|pages=149–155|bibcode=1991A&A...249..149M }}</ref>
| radius2 = {{solar radius calculator|type=LT|0.5|3500|decimals=1}}<ref name=Magazzu1991/>{{Efn|name=radius2|1=Calculated, using the [Stefan-Boltzmann law](/source/Stefan-Boltzmann_law) and the star's [effective temperature](/source/effective_temperature) and luminosity, with respect to the [solar](/source/Sun) nominal effective temperature of {{val|fmt=commas|5,772|ul=K}}:<math display="block">\sqrt{\biggl(\frac{5,772}{3,500}\biggr)^4 \cdot 0.5} = 1.9\ R_\odot.</math>}}
| temperature2 = 3,500<ref name=Magazzu1991/>
| luminosity2 = 0.5<ref name=Magazzu1991/>
| gravity2 = 3.5<ref name=Magazzu1991/>
| age_myr2 = 1<ref name=Magazzu1991/>
}}
{{Starbox catalog
 |names=[UX](/source/Variable_star_designation) Tau, [HD](/source/Henry_Draper_Catalogue) 285846, [HIP](/source/Hipparcos_catalogue) 20990, [WDS](/source/Washington_Double_Star_Catalogue) J04301+1814AB, [CCDM](/source/Catalog_of_Components_of_Double_and_Multiple_Stars) J04301+1814AB, [1RXS](/source/1RXS) J043004.5+181342<ref name="SIMBAD">{{cite simbad | title=UX Tau | access-date=5 December 2016}}</ref>
}}
{{Starbox reference
 |Simbad=UX+Tau}}
{{Starbox end}}
__NOTOC__
[[File:UXTauLightCurve.png|thumb|left|A [visual-band](/source/Photometric_system) [light curve](/source/light_curve) for UX&nbsp;Tauri, plotted from ''[ASAS-SN](/source/ASAS-SN)'' data<ref name="ASAS-SN"/>]]
'''UX Tauri''', abbreviated as '''UX Tau''', is a [binary star](/source/binary_star) system approximately 450 [light-year](/source/light-year)s away in the [constellation](/source/constellation) of [Taurus](/source/Taurus_(constellation)) (the [Bull](/source/Bull)). It is notable for the fact that, despite its recent (in stellar terms) [creation](/source/planetary_system), the [Spitzer Space Telescope](/source/Spitzer_Space_Telescope) discovered that its [protoplanetary disk](/source/protoplanetary_disk) contains a gap. The dust, which normally accumulates in an expanding ring starting right next to the star at such a young age, is either very thin or nonexistent at a range of 0.2 to 56 [AU](/source/astronomical_unit) from the star. Typically, this means that the early ancestors of [planets](/source/planets) may be forming from the disk, though the star only ignited about 1 million years ago.<ref>{{Cite web |url=http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20071128.html |title=NASA - Youthful Star Sprouts Planets Early<!-- Bot generated title --> |access-date=2007-11-28 |archive-date=2012-10-21 |archive-url=https://web.archive.org/web/20121021170908/http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20071128.html |url-status=dead }}</ref> In contrast, [Earth](/source/Earth) was formed approximately 4.54 billion years ago, placing its formation about sixty million years after the [Sun](/source/Sun)'s ignition around 4.6 billion years ago.
{{clear left}}
==See also==
* [HD 98800](/source/HD_98800)
* [Vega](/source/Vega)
* [V4046 Sagittarii](/source/V4046_Sagittarii)

==Notes==
{{notelist}}

==References==
<references>
<ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>

<ref name=Mendigutia2026>{{Cite journal |last=Mendigutía |first=I. |last2=Campbell-White |first2=J. |last3=Montesinos |first3=B. |last4=Maldonado |first4=J. |last5=Fullana-García |first5=L. |last6=Mirouh |first6=G. M. |last7=Meeus |first7=G. |last8=Vioque |first8=M. |last9=Sicilia-Aguilar |first9=A. |last10=Zapatero-Osorio |first10=M. R. |last11=Villaver |first11=E. |last12=Kahar |first12=R. |date=2026-04-06 |title=Lithium and the evolution of intermediate-mass T Tauri and Herbig stars. Rotation, accretion, and planets |journal=Astronomy & Astrophysics |doi=10.1051/0004-6361/202659302 |arxiv=2604.05040 |issn=0004-6361}}</ref>
</references>

==External links==
* {{Cite journal |journal=Astronomy and Astrophysics |bibcode=1991A&A...249..149M |title=Lithium in the pre-main sequence triple system UX Tauri |date=September 1991 |volume=249 |issue=1 |author=Magazzu, A. |author2=Martin, E. L. |author3=Rebolo, R.|page=149 }}
* {{cite web |url=http://jumk.de/astronomie/exoplanets/ux-tauri.shtml |title=UX Tauri |access-date=2008-06-16 |work=Jumk.de}}

{{Stars of Taurus}}

Category:Circumstellar disks
Category:Binary stars
Category:T Tauri stars
Category:Taurus (constellation)
Category:Hypothetical planetary systems
Tauri, UX
Category:K-type main-sequence stars
Category:M-type main-sequence stars
Category:Emission-line stars
285846
020990

{{var-star-stub}}
{{Multi-star-stub}}

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Adapted from the Wikipedia article [UX Tauri](https://en.wikipedia.org/wiki/UX_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/UX_Tauri?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.