# 39 Tauri

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> Markdown URL: https://mediated.wiki/source/39_Tauri.md
> Source: https://en.wikipedia.org/wiki/39_Tauri
> Source revision: 1331714118
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{{Short description|Star in the constellation Taurus}}
{{other stars by Bayer designation|A Tauri}}
{{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=10|mark_link=39 Tauri
|x=700|y=385
}}
| caption = Location of 39 Tauri (circled in red)
}}
{{Starbox observe
 | epoch       = J2000
 | constell    = [Taurus](/source/Taurus_(constellation))
 | ra          = {{RA|04|05|20.258}}<ref name=GaiaDR3/>
 | dec         = {{DEC|+22|00|32.06}}<ref name=GaiaDR3/>
 | appmag_v    = 5.90<ref name="Ghezzi2010"/>
}}
{{Starbox character
 | type        = [main sequence](/source/main_sequence)<ref name=GaiaDR3/>
 | class       = G5&nbsp;V<ref name="Shenavrin2011"/>
 | b-v         = +0.62<ref name="Johnson1966"/>
 | u-b         = +0.12<ref name="Johnson1966"/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = +24.0{{±|0.1}}<ref name="LópezSantiago2010"/>
 | prop_mo_ra  = {{val|+172.212}}
 | prop_mo_dec = {{val|−130.609}}
 | pm_footnote = <ref name=GaiaDR3/>
 | parallax    = 59.4728
 | p_error     = 0.0361
 | parallax_footnote = <ref name=GaiaDR3/>
 | absmag_v    = 
}}
{{Starbox detail
 | mass        = 1.10{{±|0.10}}<ref name="Ghezzi2010"/>
 | radius      = 0.96{{±|0.07}}<ref name="Ghezzi2010"/>
 | gravity     = 4.52{{±|0.09}}<ref name="Ghezzi2010"/>
 | metal_fe    = 0.14{{±|0.03}}<ref name="Ghezzi2010"/>
 | temperature = 5,903{{±|36}}<ref name="Ghezzi2010"/>
 | luminosity  = 1.01<ref name="Ghezzi2010"/>
 | rotational_velocity = 5.52<ref name="MartínezArnáiz2010"/>
 | rotation    = 9.12<ref name="LópezSantiago2010"/> d
 | age_gyr     = 1.0<ref name="Ghezzi2010"/>
}}
{{Starbox catalog
 | names = {{odlist | F=39&nbsp;Tau | BD=+21&nbsp;587 | GJ=160 | HD=25680 | HIP=19076 | HR=1262 | SAO=76438 }}<ref name="SIMBAD"/>
}}
{{Starbox reference
 | Simbad = 39+Tau
 | ARICNS = 00348
}}
{{Starbox end}}

'''39 Tauri''' is a [binary star](/source/binary_star) in the northern [constellation](/source/constellation) of [Taurus](/source/Taurus_(constellation)). It has an [apparent visual magnitude](/source/apparent_visual_magnitude) of 5.90, so, according to the [Bortle scale](/source/Bortle_scale), it is faintly visible from suburban skies at night. Measurements made with the [Hipparcos](/source/Hipparcos) spacecraft show an annual [parallax](/source/parallax) shift of 0.0594728″, which is equivalent to a distance of around 55&nbsp;[light year](/source/light_year)s from the Sun.

[[File:39TauLightCurve.png|thumb|left|A [light curve](/source/light_curve) for 39 Tauri, plotted from [''Kepler'' (K2)](/source/Kepler_space_telescope) data<ref name=MAST/>]]
39 Tauri has been resolved into a pair of stars using [speckle interferometry](/source/speckle_interferometry).<ref name=hartkopf2009/>  However, many observations have failed to resolve the secondary star.<ref name="Roberts2005"/>

A [stellar classification](/source/stellar_classification) of G5&nbsp;V<ref name="Shenavrin2011"/> matches that of a [G-type main sequence star](/source/G-type_main_sequence_star); the type of the secondary component is unknown. Stellar models indicate the primary component is similar in physical properties to the Sun, with 110% of the Sun's mass, 96% of the radius, and shining with almost the same luminosity.<ref name="Ghezzi2010"/> The overall [metallicity](/source/metallicity) of the star—the abundance of elements other than hydrogen and helium—is similar to the Sun.<ref name="Casagrande2011"/> At a relatively youthful estimated age of one billion years,<ref name="Ghezzi2010"/> it is rotating with a period of 9.12<ref name="LópezSantiago2010"/> days. Based upon Hipparcos data, it displays a mild [variability](/source/Variable_star) with an [amplitude](/source/amplitude) of 0.06&nbsp;[magnitude](/source/Magnitude_(astronomy)).<ref name="Adelman2000"/>

The [space velocity](/source/Space_velocity_(astronomy)) components of 39 Tauri are: –25.0(U), –14.0(V), –6.0(W). The surface activity and kinematic properties of this star are consistent with membership in the [IC 2391](/source/IC_2391) [moving group](/source/moving_group).<ref name="Murgas2013"/> It is following an orbit through the [Milky Way](/source/Milky_Way) galaxy that has an [eccentricity](/source/Orbital_eccentricity) of 0.06 carrying it as close as {{Convert|7.34|kpc|kly|abbr=on|disp=flip}} to the [Galactic Center](/source/Galactic_Center), and as far away as {{Convert|8.21|kpc|kly|abbr=on|disp=flip}}. The [orbital inclination](/source/orbital_inclination) will carry the star no further than {{Convert|10|pc|ly|abbr=on|disp=flip}} away from the [galactic plane](/source/galactic_plane).<ref name="Casagrande2011"/>

==References==
{{Reflist|refs=

<ref name=GaiaDR3>{{Cite Gaia DR3|53112944270520832}}</ref>

<ref name=hartkopf2009>{{citation
 | title=Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits 
 | last1=Hartkopf | first1=William I. | last2=Mason | first2=Brian D.
 | journal=The Astronomical Journal
 | volume=138 | issue=3 | pages=813–826 | date=September 2009
 | doi=10.1088/0004-6256/138/3/813 | bibcode=2009AJ....138..813H | doi-access=free }}.</ref>

<ref name=MAST>{{citation
 | 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=19 September 2022}}.</ref>

<ref name="Johnson1966">{{citation
 | display-authors=1
 | last1=Johnson | first1=H. L.
 | last2=Iriarte | first2=B.
 | last3=Mitchell | first3=R. I.
 | last4=Wisniewskj | first4=W. Z.
 | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory
 | volume=4 | issue=99 | year=1966
 | page=99 | bibcode=1966CoLPL...4...99J
}}.</ref>

<ref name="Ghezzi2010">{{citation
 | display-authors=1
 | last1=Ghezzi | first1=L.
 | last2=Cunha | first2=K.
 | last3=Smith | first3=V. V.
 | last4=de Araújo | first4=F. X.
 | last5=Schuler | first5=S. C.
 | last6=de la Reza | first6=R.
 | title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
 | journal=The Astrophysical Journal
 | volume=720 | issue=2 | pages=1290–1302
 | date=September 2010
 | doi=10.1088/0004-637X/720/2/1290
 | bibcode=2010ApJ...720.1290G
 | arxiv=1007.2681
 | s2cid=118565025
}}.</ref>

<ref name="Shenavrin2011">{{citation
 | display-authors=1
 | last1=Shenavrin | first1=V. I.
 | last2=Taranova | first2=O. G.
 | last3=Nadzhip | first3=A. E.
 | title=Search for and study of hot circumstellar dust envelopes
 | journal=Astronomy Reports
 | volume=55 | issue=1 | pages=31–81
 | date=January 2011
 | doi=10.1134/S1063772911010070
 | bibcode=2011ARep...55...31S
 | s2cid=122700080
}}.</ref>

<ref name="MartínezArnáiz2010">{{citation
 | display-authors=1
 | last1=Martínez-Arnáiz | first1=R.
 | last2=Maldonado | first2=J.
 | last3=Montes | first3=D.
 | last4=Eiroa | first4=C.
 | last5=Montesinos | first5=B.
 | title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
 | journal=Astronomy and Astrophysics
 | volume=520 | page=A79
 | date=September 2010
 | doi=10.1051/0004-6361/200913725
 | bibcode=2010A&A...520A..79M
 | arxiv=1002.4391
 | s2cid=43455849}}.</ref>

<ref name="Murgas2013">{{citation
 | display-authors=1
 | last1=Murgas | first1=F.
 | last2=Jenkins | first2=J. S.
 | last3=Rojo | first3=P.
 | last4=Jones | first4=H. R. A.
 | last5=Pinfield | first5=D. J.
 | title=Stellar activity as a tracer of moving groups
 | journal=Astronomy and Astrophysics
 | volume=552 | page=A27
 | date=April 2013
 | doi=10.1051/0004-6361/201219483
 | bibcode=2013A&A...552A..27M
 | arxiv=1302.6935
 | s2cid=7621053
}}.</ref>

<ref name="Casagrande2011">{{citation
 | display-authors=1
 | last1=Casagrande | first1=L.
 | last2=Schönrich | first2=R.
 | last3=Asplund | first3=M.
 | last4=Cassisi | first4=S.
 | last5=Ramírez | first5=I.
 | last6=Meléndez | first6=J.
 | last7=Bensby | first7=T.
 | last8=Feltzing | first8=S.
 | title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
 | journal=Astronomy and Astrophysics
 | volume=530 | page=A138
 | date=June 2011
 | doi=10.1051/0004-6361/201016276
 | bibcode=2011A&A...530A.138C
 | arxiv=1103.4651
 | s2cid=56118016
}}.</ref>

<ref name="LópezSantiago2010">{{citation
 | display-authors=1
 | last1=López-Santiago | first1=J.
 | last2=Montes | first2=D.
 | last3=Gálvez-Ortiz | first3=M. C.
 | last4=Crespo-Chacón | first4=I.
 | last5=Martínez-Arnáiz | first5=R. M.
 | last6=Fernández-Figueroa | first6=M. J.
 | last7=de Castro | first7=E.
 | last8=Cornide | first8=M.
 | title=A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age
 | journal=Astronomy and Astrophysics
 | volume=515 | page=A97
 | date=May 2010
 | doi=10.1051/0004-6361/200913437
 | bibcode=2010A&A...514A..97L
 | arxiv=1002.1663
 | s2cid=118640516
}}.</ref>

<ref name="Roberts2005">{{citation
 | display-authors=1
 | last1=Roberts | first1=Lewis C. Jr.
 | last2=Turner | first2=Nils H.
 | last3=Bradford | first3=L. William
 | last4=ten Brummelaar | first4=Theo A.
 | last5=Oppenheimer | first5=Ben R.
 | last6=Kuhn | first6=Jeff R.
 | last7=Whitman | first7=Kathryn
 | last8=Perrin | first8=Marshall D.
 | last9=Graham | first9=James R.
 | title=Adaptive Optics Photometry and Astrometry of Binary Stars
 | journal=The Astronomical Journal
 | volume=130 | issue=5 | pages=2262–2271
 | date=November 2005
 | doi=10.1086/491586
 | bibcode=2005AJ....130.2262R
 | doi-access=free
 }}.</ref>

<ref name="Adelman2000">{{citation
 | display-authors=1
 | last1=Adelman | first1=S. J.
 | last2=Davis | first2=J. M.
 | last3=Lee | first3=A. S.
 | title=On the Variability of G0-G9 Stars
 | journal=Information Bulletin on Variable Stars
 | volume=4993 | page=1
 | date=December 2000
 | bibcode=2000IBVS.4993....1A
}}.</ref>

<ref name="SIMBAD">{{cite simbad
 | title=39 Tau
 | access-date=2013-10-13
}}</ref>

}}

{{Stars of Taurus}}
{{Sky|04|05|20.26|+|22|00|32.05}}

Category:G-type main-sequence stars
Category:Astrometric binaries
Category:Taurus (constellation)
Tauri, A2
Tauri, 039
1262
BD+21 0587
0160
025680
019076

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Adapted from the Wikipedia article [39 Tauri](https://en.wikipedia.org/wiki/39_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/39_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.