View source for UX Tauri

{{Short description|Binary star system  in the constellation Taurus}}
{{Starbox begin
| name = UX Tauri
}}
{{Starbox image
|image=[[File:UX Tauri A.jpg|250px]]
|caption=An artist's conception of a circumstellar disk around UX Tauri A, along with several hypothetical protoplanets.
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[Taurus (constellation)|Taurus]]
| ra = {{RA|04|30|03.99626}}<ref name="van Leeuwen2007">{{cite journal | 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 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=14774 Vizier catalog entry ]</ref>
| dec = {{DEC|+18|13|49.4355}}<ref name="van Leeuwen2007"/>
| appmag_v = +10.80<ref name="SIMBAD">{{cite simbad | title=UX Tau | access-date=5 December 2016}}</ref>
}}
{{Starbox character
| class = K2Ve + M1Ve<ref>{{cite journal | last1=Herbig | first1=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>
}}
{{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|author=Gontcharov, 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<ref name="van Leeuwen2007"/>
| prop_mo_dec=-21.91<ref name="van Leeuwen2007"/>
| parallax = -3.70<ref name="van Leeuwen2007"/>
| p_error = 5.73
| dist_ly = 450
| dist_pc = 138
}}
{{Starbox detail
| source = <ref>{{cite journal|author1=Magazzu, 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>
| component1 = UX Tauri A
| mass = 1.25
| temperature = 4460
| luminosity = 1.3
| gravity = 4.0
| age_myr = 3
| component2 = UX Tauri B
| mass2 = 0.4
| temperature2 = 3500
| luminosity2 = 0.5
| gravity2 = 3.5
| age_myr2 = 1
}}
{{Starbox catalog
|names=[[Variable star designation|UX]] Tau, [[Henry Draper Catalogue|HD]] 285846, [[Hipparcos catalogue|HIP]] 20990, [[Washington Double Star Catalogue|WDS]] J04301+1814AB, [[Catalog of Components of Double and Multiple Stars|CCDM]] J04301+1814AB, [[1RXS]] J043004.5+181342 }}
{{Starbox reference
|Simbad=UX+Tau}}
{{Starbox end}}
[[File:UXTauLightCurve.png|thumb|left|A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for UX&nbsp;Tauri, plotted from ''[[All Sky Automated Survey for SuperNovae|ASAS-SN]]'' data<ref name="ASAS-SN"/>]]
'''UX Tauri''', abbreviated as '''UX Tau''', is a [[binary star]] system approximately 450 [[light-year]]s away in the [[constellation]] of [[Taurus (constellation)|Taurus]] (the [[Bull]]). It is notable for the fact that, despite its recent (in stellar terms) [[planetary system#Origin and evolution|creation]], the [[Spitzer Space Telescope]] discovered that its [[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 [[astronomical unit|AU]] from the star. Typically, this means that the early ancestors of [[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]] was formed approximately 4.54 billion years ago, placing its formation about sixty million years after the [[Sun]]'s ignition around 4.6 billion years ago.
==See also==
* [[HD 98800]]
* [[Vega]]
* [[V4046 Sagittarii]]
==References==
{{reflist|refs=
<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>
}}
==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}}
{{DEFAULTSORT:UX Tauri}}
[[Category:Circumstellar disks]]
[[Category:Binary stars]]
[[Category:T Tauri stars]]
[[Category:Taurus (constellation)]]
[[Category:Hypothetical planetary systems]]
[[Category:Objects with variable star designations|Tauri, UX]]
[[Category:K-type main-sequence stars]]
[[Category:M-type main-sequence stars]]
[[Category:Emission-line stars]]
[[Category:Henry Draper Catalogue objects|285846]]
[[Category:Hipparcos objects|020990]]
{{var-star-stub}}
{{Multi-star-stub}}