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EQ Virginis

EQ Virginis

A light curve for EQ Virginis, plotted from Kepler data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 34m 43.2063s[2]
Declination −08° 20′ 31.3353″[2]
Apparent magnitude (V) 9.36[3]
Characteristics
Spectral type K5Ve[3]
Variable type UV Cet + BY Dra[4]
Astrometry
Radial velocity (Rv)−23.16±0.16[2] km/s
Proper motion (μ) RA: −286.577±0.110 mas/yr[2]
Dec.: −91.866±0.083 mas/yr[2]
Parallax (π)48.7322 ± 0.0587 mas[2]
Distance66.93 ± 0.08 ly
(20.52 ± 0.02 pc)
Absolute magnitude (MV)10.51
Details
Mass0.68[5] M☉
Radius0.62+0.02
−0.04[2] R☉
Luminosity0.136±0.001[2] L☉
Surface gravity (log g)4.49[6] cgs
Temperature4,224±80[6] K
Metallicity [Fe/H]−0.144[7] dex
Rotation3.9±0.1[7] days
Rotational velocity (v sin i)2.06[7] km/s
Age30-50[8] Myr
Other designations
EQ Vir, BD−07°3646, GJ 517, HD 118100, HIP 66252, SAO 139419, LTT 5253, PLX 3101, Ross 478[9]
Database references
SIMBADdata
ARICNSdata

EQ Virginis is a single[10] variable star in the equatorial constellation of Virgo. It has a baseline visual apparent magnitude of 9.36,[3] but is a flare star that undergoes sporadic bursts of brightening. The star is located at a distance of 67 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −23 km/s.[2] It is a member of the IC 2391 moving group[11] of stars, which is between 30 and 50 million years old.[8]

This is an orange-hued K-type main-sequence star with a stellar classification of K5Ve,[3] where the 'e' suffix indicates emission lines in the spectrum. It is a young, rapidly rotating star with a mean magnetic field strength of 2,500±300 G.[12] The star is classified as an eruptive variable of the UV Ceti type and a BY Draconis variable.[4] It shows strong chromospheric activity with extensive star spots that, on average, cover ~24% of the surface.[7] The star displays a strong X-ray emission.[12]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Keenan_McNeil_1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Luck2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Casagrande 2011 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Morris_et_al_2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Paulson 2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference montes 2001 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Saar_et_al_1986 was invoked but never defined (see the help page).

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