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Star in the constellation Virgo
Tau Virginis (τ Vir, τ Virginis) is a single
[13]
star in the
zodiac
constellation
Virgo . With an
apparent visual magnitude of 4.28,
[2] it is faintly visible to the naked eye. The distance to Tau Virginis, based upon
parallax measurements, is approximately 225
light years with a
margin of error of ±3 light years.
This star has a
stellar classification of A2IV/V,
[3] which matches the spectrum of an
A-type main sequence star mixed with spectral traits of a
subgiant . It is about 700
[7] million years old and is spinning rapidly with a
projected rotational velocity of 186 km/s.
[11] The star has nearly double
[7] the
mass of the Sun and about 160% of the
Sun's radius .
[8] It shines with 70
[9] times the
luminosity of the Sun and has an
effective temperature of 8413 K in its
outer atmosphere .
[7]
Tau Virginis has multiple
visual companions , listed below:
[14]
Companion
Visual Magnitude
Angular Separation
Position Angle
Year Measured
B
9.41
82.70
″
287°
2012
C
13.10
176.70″
353°
2000
D
9.68
342.70″
85°
2012
E
12.00
14.6″
175°
2009
References
^
a
b
c
d
e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664,
arXiv :
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S2CID
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^
a
b Adelman, S. J. (February 2001).
"Research Note Hipparcos photometry: The least variable stars" . Astronomy and Astrophysics . 367 (1): 297–298.
Bibcode :
2001A&A...367..297A .
doi :
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^
a
b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5", Michigan Spectral Survey , 05 ,
Bibcode :
1999MSS...C05....0H
^
a
b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data ,
SIMBAD ,
Bibcode :
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^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759–771,
arXiv :
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Bibcode :
2006AstL...32..759G ,
doi :
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S2CID
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^ Blondel, P. F. C.; Djie, H. R. E. Tjin A. (September 2006),
"Modeling of PMS Ae/Fe stars using UV spectra" (PDF) , Astronomy and Astrophysics , 456 (3): 1045–1068,
Bibcode :
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^
a
b
c
d
e
f
g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal , 804 (2): 146,
arXiv :
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Bibcode :
2015ApJ...804..146D ,
doi :
10.1088/0004-637X/804/2/146 ,
S2CID
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^
a
b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics , 367 (2): 521–524,
arXiv :
astro-ph/0012289 ,
Bibcode :
2001A&A...367..521P ,
doi :
10.1051/0004-6361:20000451 ,
S2CID
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^
a
b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–57,
arXiv :
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Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^ Morossi, C.; et al. (September 2002), "Metallicity Determinations from Ultraviolet-Visual Spectrophotometry. I. The Test Sample", The Astrophysical Journal , 577 (1): 377–388,
Bibcode :
2002ApJ...577..377M ,
doi :
10.1086/342144 .
^
a
b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics , 463 (2): 671–682,
arXiv :
astro-ph/0610785 ,
Bibcode :
2007A&A...463..671R ,
doi :
10.1051/0004-6361:20065224 ,
S2CID
18475298 .
^
"* tau Vir" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2016-09-16 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",
Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879,
arXiv :
0806.2878 ,
Bibcode :
2008MNRAS.389..869E ,
doi :
10.1111/j.1365-2966.2008.13596.x ,
S2CID
14878976 .
^ Mason, B. D.; et al. (2014),
"The Washington Visual Double Star Catalog" , The Astronomical Journal , 122 (6): 3466–3471,
Bibcode :
2001AJ....122.3466M ,
doi :
10.1086/323920 , retrieved 2015-07-22 .