| mass = 2.17
| radius = 9.62
| luminosity = 57
| gravity = 3.17
| temperature = 5,107
| metal_fe = −0.30
| rotational_velocity = 2.23
| age_gyr = 0.88
}}{{Starbox catalog
| names = 9 Virginis, ο Vir, BD+09°2583, FK5 450, GJ 3703, HD 104979, HIP 58948, HR 4608, SAO 119213
}}{{Starbox reference
| Simbad = Omicron+Virginis
}}{{Starbox end}}Omicron Virginis (ο Vir, ο Virginis) is a star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of +4.12.[9] Based upon parallax measurements, it is about 163 light years from the Sun.
ο Virginis is a G-type giant star with a stellar classification of G8 IIIa CN-1Ba1CH1.[4] This indicates that it is a Barium star. Typically Barium stars are close binaries with a white dwarf companion, but no companion ihas been detected for ο Virginis.[13] It has been suggested that an excess SiIV emission flux is due to an unseen white dwarf companion.[14]
ο Virginis is a giant star around tens times larger than the sun. Although it is slightly cooler, it is radiating about 60-132 times the luminosity of the Sun. It is over twice as massive as the sun and is around a billion years old.[9][ A simplified statistical analysis suggests that ο Virginis is likely to be a red giant branch star fusing hydrogen in a shell around an inert helium core, but there is about a 22% chance that it is a horizontal branch star fusing helium in its core.[17]]
References
1. ^1 {{cite journal | bibcode=2000ApJ...533..969B| title=Do All BA II Stars Have White Dwarf Companions?| journal=The Astrophysical Journal| volume=533| issue=2| pages=969| author1=Böhm-Vitense| first1=Erika| last2=Carpenter| first2=Kenneth| last3=Robinson| first3=Richard| last4=Ake| first4=Tom| last5=Brown| first5=Jeffery| year=2000| doi=10.1086/308678}}
2. ^1 2 3 4 5 {{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | 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 | postscript=. }}
3. ^1 {{citation | last1=Mallik | first1=Sushma V. | title=Lithium abundance and mass | journal=Astronomy and Astrophysics | volume=352 | pages=495–507 |date=December 1999 | bibcode=1999A&A...352..495M | postscript=. }}
4. ^1 2 3 {{citation | display-authors=1 | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | title=Stellar Parameters and Elemental Abundances of Late-G Giants | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 | date=August 2008 | bibcode=2008PASJ...60..781T | doi=10.1093/pasj/60.4.781 | arxiv = 0805.2434 | postscript=.}}
5. ^1 2 {{citation | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | doi=10.1086/191373 | bibcode=1989ApJS...71..245K | postscript=. }}
6. ^1 {{cite journal | bibcode=2000IAUS..177..277Z| title=The Chemical Composition and Orbital Parameters of Barium Stars| journal=The Carbon Star Phenomenon| volume=177| pages=277| author1=Začs| first1=Laimons| year=2000}}
7. ^1 {{cite journal | bibcode=2015A&A...574A.116R| title=Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity| journal=Astronomy & Astrophysics| volume=574| pages=A116| author1=Reffert| first1=Sabine| last2=Bergmann| first2=Christoph| last3=Quirrenbach| first3=Andreas| last4=Trifonov| first4=Trifon| last5=Künstler| first5=Andreas| year=2015| doi=10.1051/0004-6361/201322360|arxiv = 1412.4634 | hdl=10722/215277}}