Star in the constellation Virgo
Omega Virginis (ω Vir, ω Virginis) is a solitary[ 5] star in thezodiac constellation Virgo . It has anapparent visual magnitude of +5.2,[ 5] naked eye . Based upon an annualstellar parallax shift of 6.56 milliarcseconds ,[ 1] light years from theSun .
Alight curve for Omega Virginis, plotted fromHipparcos [ 12] This is ared giant star with astellar classification of M4 III.[ 5] asymptotic giant branch (AGB), with shells of hydrogen and helium around a carbon-oxygen core.[ 4] evolving away from themain sequence it has expanded to around 109 times thesolar radius , and now shines with 1,470 times theluminosity of the Sun . Theeffective temperature of thephotosphere is 3,433 K.[ 10]
Omega Virginis is asemiregular variable with a brightness that varies over anamplitude of 0.28 with periods of 30 and 275 days.[ 13] General Catalogue of Variable Stars gives the magnitude range as 5.23 to 5.50.[ 2] [ 14] [ 15]
^a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics ,474 (2):653– 664,arXiv :0708.1752 Bibcode :2007A&A...474..653V ,doi :10.1051/0004-6361:20078357 ,S2CID 18759600 . ^a b c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports 61 (1):80– 88,Bibcode :2017ARep...61...80S ,doi :10.1134/S1063772917010085 ,S2CID 125853869 . ^a b "Omega Vir" ,International Variable Star Index ,AAVSO , retrieved2022-01-08 ^a b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun",Astronomical Journal ,104 (1):275– 313,Bibcode :1992AJ....104..275E ,doi :10.1086/116239 ^a b c d 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 . ^a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data ,SIMBAD ,Bibcode :1986EgUBV........0M . ^ Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations",Astronomy and Astrophysics ,498 (2):627– 640,arXiv :0901.0934 Bibcode :2009A&A...498..627F ,doi :10.1051/0004-6361/200810698 ,S2CID 18739721 ^a b c Smith, V.V.; Lambert, D.L. (1986), "The chemical composition of red giants. II - Helium burning and the s-process in the MS and S stars",Astrophysical Journal ,311 :843– 863,Bibcode :1986ApJ...311..843S ,doi :10.1086/164823 ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021), "Stellar and substellar companions fromGaia EDR3",Astronomy & Astrophysics ,657 : A7,arXiv :2109.10912 Bibcode :2022A&A...657A...7K ,doi :10.1051/0004-6361/202142146 eISSN 1432-0746 ,ISSN 0004-6361 ^a b c d McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars",Monthly Notices of the Royal Astronomical Society ,471 :770– 791,arXiv :1706.02208 Bibcode :2017MNRAS.471..770M ,doi :10.1093/mnras/stx1433 ISSN 0035-8711 Omega Virginis' database entry atVizieR .^ "* ome Vir" ,SIMBAD Centre de données astronomiques de Strasbourg , retrieved2016-09-19 .^ "/ftp/cats/more/HIP/cdroms/cats" ,Centre de Données astronomiques de Strasbourg , Strasbourg astronomical Data Center, retrieved15 October 2022 ^ Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood",Monthly Notices of the Royal Astronomical Society ,378 (4):1543– 1549,arXiv :0704.3150 Bibcode :2007MNRAS.378.1543G ,doi :10.1111/j.1365-2966.2007.11903.x S2CID 14332208 . ^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (1973), "59th Name-List of Variable Stars",Information Bulletin on Variable Stars ,834 : 1,Bibcode :1973IBVS..834....1K ^ Eggen, Olin J. (1969), "Light Variations of Small Amplitude in the Red Giants of the Disc Population",Information Bulletin on Variable Stars ,355 (355, #1. (IBVS Homepage)): 1,Bibcode :1969IBVS..355....1E
