# 71 Tauri

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> Markdown URL: https://mediated.wiki/source/71_Tauri.md
> Source: https://en.wikipedia.org/wiki/71_Tauri
> Source revision: 1337672820
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{short description|Star in the constellation Taurus}}
{{Starbox begin}}
{{Starbox image
| image =
{{Location mark
|image=Taurus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=8|mark_link=71 Tauri
|x=565|y=568
}}
| caption = Location of 71 Tauri (circled in red)
}}
{{Starbox observe
 | epoch = [J2000.0](/source/J2000.0)
 | constell = [Taurus](/source/Taurus_(constellation))
 | ra = {{RA|04|26|20.77082}}<ref name=GaiaDR3/>
 | dec = {{DEC|+15|37|05.8841}}<ref name=GaiaDR3/>
 | appmag_v = +4.48<ref name="MERMILLIOD"/>
}}
{{Starbox character
 | type = [main sequence](/source/main_sequence)<ref name=GaiaDR3/>
 | class = F0&nbsp;V<ref name=Mullan2000/>
 | b-v = +0.25<ref name="MERMILLIOD"/>
 | u-b = +0.13<ref name="MERMILLIOD"/>
 | variable = [δ Sct](/source/Delta_Scuti_variable)<ref name=Samus2017/>
}}
{{Starbox astrometry
 | radial_v = +38.3<ref name=rgcrv/>
 | prop_mo_ra = +87.435<ref name=GaiaDR3/>
 | prop_mo_dec = −20.978<ref name=GaiaDR3/>
 | parallax = 21.3957
 | p_error = 0.2511
 | parallax_footnote = <ref name=GaiaDR3/>
 | absmag_v = 1.10<ref name=aaa361_614/>
}}
{{Starbox detail
 | mass = 1.94<ref name=aaa361_614/>
 | radius = 3.34<ref name=Mullan2000/>
 | luminosity = 
 | gravity = 3.73<ref name=David2015/>
 | temperature = 7,543<ref name=Mullan2000/>
 | metal_fe = 
 | rotation = 14.2<ref name=aaa361_614/>&nbsp;d
 | rotational_velocity = 192<ref name=aaa361_614/>
 | age_myr = 966<ref name=David2015/>
}}
{{Starbox catalog
 | names = {{odlist | F=71 Tau | V=V777 Tau | BD=+15°625 | HD=28052 | HIP=20713 | HR=1394 | SAO=93932 | GC=5375 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad=71+Tau
}}
{{Starbox end}}

'''71 Tauri''' is a suspected [triple star](/source/triple_star)<ref name=Eggleton2008/> system in the [zodiac](/source/zodiac) [constellation](/source/constellation) [Taurus](/source/Taurus_(constellation)), located 152&nbsp;[light year](/source/light_year)s from the Sun.<ref name=GaiaDR3/> It is visible to the [naked eye](/source/naked_eye) as a faint, yellow-white hued star with an [apparent visual magnitude](/source/apparent_visual_magnitude) of +4.48.<ref name="MERMILLIOD"/> The star is moving further away from the Earth with a heliocentric [radial velocity](/source/radial_velocity) of +38&nbsp;km/s.<ref name=rgcrv/> It is a member of the [Hyades open cluster](/source/Hyades_(star_cluster)).<ref name=Simon2000/>

[[File:V777TauLightCurve.png|thumb|left|250px|A [light curve](/source/light_curve) for V777 Tauri, plotted from ''[TESS](/source/Transiting_Exoplanet_Survey_Satellite)'' data<ref name=MAST/>]]

The primary component is an [F-type main-sequence star](/source/F-type_main-sequence_star) with a [stellar classification](/source/stellar_classification) of F0&nbsp;V.<ref name=Mullan2000/> In 1979, Stephen Horan discovered that 71 Tauri is a [variable star](/source/variable_star).<ref name="AJ1979"/> It was given its [variable star designation](/source/variable_star_designation), V777 Tauri, in 1981.<ref name="IBVS1981"/> It is a [Delta Scuti variable](/source/Delta_Scuti_variable) with an [amplitude](/source/amplitude) of 0.02 in magnitude and a frequency of 0.16&nbsp;d<sup>−1</sup>.<ref name=Samus2017/> This star has about 1.94<ref name=aaa361_614/> times the [mass of the Sun](/source/mass_of_the_Sun) and 3.34<ref name=Mullan2000/> times the [Sun's radius](/source/Sun's_radius). It has a [projected rotational velocity](/source/projected_rotational_velocity) of 192&nbsp;km s<sup>−1</sup>, for an estimated rotation period of 14.2 days.<ref name=aaa361_614/> Extreme ultraviolet flares have been observed coming from this star's hot [corona](/source/stellar_corona),<ref name=Mullan2000/> and it is the second brightest [X-ray source](/source/X-ray_astronomy) in the Hyades.<ref name=Simon2000/>
{{clear left}}
==References==
<references>
<ref name=GaiaDR3>{{cite DR3|3312759303913978624}}</ref>

<ref name=MAST>{{cite web
 | 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="AJ1979">{{cite journal
 | last1=Horan | first1=S. | title=A photometric survey of the Hyades for delta Scuti variables
 | journal=Astronomical Journal | date=November 1979 | volume=84 | pages=1770-1774 | doi=10.1086/112607
 | bibcode=1979AJ.....84.1770H }}</ref>

<ref name="IBVS1981">{{cite journal
 | last1=Kholopov | first1=P. N. | last2=Samus | first2=N. N. | last3=Kukarkina | first3=N. P.
 | last4=Medvedeva | first4=G. I. | last5=Perova | first5=N. B.
 | title=65th Name-List of Variable Stars | journal=Information Bulletin on Variable Stars
 | date=February 1981 | volume=1921 | pages=1-21 | bibcode=1981IBVS.1921....1K
 | url=https://ibvs.konkoly.hu/pub/ibvs/1901/1921.pdf | access-date=3 September 2025}}</ref>

<ref name=aaa361_614>{{citation
 | last1=Pizzolato | first1=N. | last2=Maggio | first2=A.
 | last3=Sciortino | first3=S.
 | title=Evolution of X-ray activity of 1-3 M<sub>sun</sub> late-type stars in early post-main-sequence phases
 | journal=Astronomy and Astrophysics
 | volume=361 | pages=614–628 | date=September 2000
 | bibcode=2000A&A...361..614P | postscript=. }}</ref>

<ref name=Mullan2000>{{citation 
 | title=Extreme-Ultraviolet Flares in an F2 Star 
 | last1=Mullan | first1=D. J. | last2=Mathioudakis | first2=M. 
 | journal=The Astrophysical Journal
 | volume=544 | issue=1 | pages=475–480 | date=November 2000
 | doi=10.1086/317202 | bibcode=2000ApJ...544..475M 
 | postscript=. | doi-access=free }}</ref>

<ref name=SIMBAD>{{citation
 | title=71 Tau -- Variable Star of delta Sct type
 | work=SIMBAD Astronomical Database
 | publisher=[Centre de Données astronomiques de Strasbourg](/source/Centre_de_Donn%C3%A9es_astronomiques_de_Strasbourg)
 | url=http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=71+tauri
 | access-date=2007-01-25 }}</ref>

<ref name=rgcrv>{{citation
 | last=Evans | first=D. S. | date=June 20–24, 1966
 | editor1-last=Batten | editor1-first=Alan Henry
 | editor2-last=Heard | editor2-first=John Frederick
 | title=The Revision of the General Catalogue of Radial Velocities
 | work=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30
 | volume=30 | page=57 | location=University of Toronto | publisher=[International Astronomical Union](/source/International_Astronomical_Union)
 | bibcode=1967IAUS...30...57E | postscript=. }}</ref>

<ref name="MERMILLIOD">{{citation
 | last1=Mermilliod | first1=J.-C.
 | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
 | journal=Catalogue of Eggen's UBV Data. SIMBAD
 | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}</ref>

<ref name=Samus2017>{{citation
 | 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
 | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 | postscript=. }}</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](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)
 | volume=389 | issue=2 | pages=869–879 | date=September 2008
 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.
 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref>

<ref name=Simon2000>{{citation
 | title=71 Tauri: Hyades Enigma Resolved? 
 | last1=Simon | first1=Theodore | last2=Ayres | first2=Thomas R.
 | journal=The Astrophysical Journal | postscript=.
 | volume=539 | issue=1 | pages=325–330 | date=August 2000
 | doi=10.1086/309228 | bibcode=2000ApJ...539..325S | doi-access=free }}</ref>
</references>

{{Stars of Taurus}}

Category:F-type main-sequence stars
Category:Delta Scuti variables
Category:Triple star systems
Category:Taurus (constellation)
Tauri, V777
BD+15 0625
Tauri, 071
028052
020713
1394
Category:Hyades (star cluster)

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Adapted from the Wikipedia article [71 Tauri](https://en.wikipedia.org/wiki/71_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/71_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.