Star in the constellation Virgo
EQ Virginis is a single[ 10] variable star in theequatorial constellation ofVirgo . It has a baselinevisual apparent magnitude of 9.36,[ 3] flare star that undergoes sporadic bursts of brightening. The star is located at a distance of 67 light-years from theSun based onparallax measurements, but is drifting closer with aradial velocity of −23 km/s.[ 2] IC 2391 moving group [ 11] [ 8]
This is an orange-huedK-type main-sequence star with astellar classification of K5Ve,[ 3] emission lines in thespectrum . It is a young, rapidly rotating star with a meanmagnetic field strength of± 300 G [ 12] eruptive variable of theUV Ceti type and aBY Draconis variable .[ 4] chromospheric activity with extensivestar spots that, on average, cover ~24% of the surface.[ 7] X-ray emission.[ 12]
^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved8 December 2021 .^a b c d e f g h Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source atVizieR .^a b c d Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars",Astrophysical Journal Supplement Series ,71 : 245,Bibcode :1989ApJS...71..245K ,doi :10.1086/191373 ,S2CID 123149047 . ^a b Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars".Astronomy Reports . GCVS 5.1.61 (1):80– 88.Bibcode :2017ARep...61...80S .doi :10.1134/S1063772917010085 .S2CID 255195566 . ^ Luck, R. Earle (March 2018)."Abundances in the Local Region. III. Southern F, G, and K Dwarfs" .The Astronomical Journal .155 (3): 31.Bibcode :2018AJ....155..111L .doi :10.3847/1538-3881/aaa9b5 S2CID 125765376 . 111. ^a b Casagrande, L.; et al. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey".Astronomy & Astrophysics .530 (A138): 21.arXiv :1103.4651 Bibcode :2011A&A...530A.138C .doi :10.1051/0004-6361/201016276 .S2CID 56118016 . ^a b c d Morris, Brett M.; et al. (September 2019)."Stellar Properties of Active G and K Stars: Exploring the Connection between Starspots and Chromospheric Activity" .The Astronomical Journal .158 (3): 16.arXiv :1907.00423 Bibcode :2019AJ....158..101M .doi :10.3847/1538-3881/ab2e04 S2CID 195767281 . 101. ^a b Paulson, Diane B.; Yelda, Sylvana; Allen, Peter R.; Kilkenny, David; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. (2006). "Differential Radial Velocities and Stellar Parameters of Nearby Young Stars".The Publications of the Astronomical Society of the Pacific .118 (843):706– 715.arXiv :astro-ph/0605433 Bibcode :2006PASP..118..706P .doi :10.1086/504115 .S2CID 16194615 . ^ "HD 118100" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2021-11-15 .^ Halbwachs, J. -L; et al. (2018). "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs".Astronomy and Astrophysics .619 : A81.arXiv :1808.04605 Bibcode :2018A&A...619A..81H .doi :10.1051/0004-6361/201833377 .S2CID 119437322 . ^ Montes, D.; et al. (2001)."Late-type members of young stellar kinematic groups - I. Single stars" .Monthly Notices of the Royal Astronomical Society .328 (1):45– 63.arXiv :astro-ph/0106537 Bibcode :2001MNRAS.328...45M .doi :10.1046/j.1365-8711.2001.04781.x S2CID 55727428 . ^a b Saar, S. H.; et al. (March 1986). "The Magnetic Field of the BY Draconis Flare Star EQ Virginis".Astrophysical Journal .302 : 777.Bibcode :1986ApJ...302..777S .doi :10.1086/164040 .
