V538 Aurigae

V538 Aurigae

A light curve for V538 Aurigae, plotted from Hipparcos data.[1] The data was folded with the period of 10.86 days which was published by Gaidos et al. (2000).[2]
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 41m 20.33573s[3]
Declination +53° 28′ 51.8106″[3]
Apparent magnitude (V) 6.25[4]
Characteristics
Evolutionary stage Main sequence
Spectral type K1 V[5]
U−B color index 0.50[4]
B−V color index 0.84[4]
Variable type BY Dra[6]
Astrometry
Radial velocity (Rv)0.9[7] km/s
Proper motion (μ) RA: +2.784[3] mas/yr
Dec.: −523.602[3] mas/yr
Parallax (π)81.4300 ± 0.0487 mas[3]
Distance40.05 ± 0.02 ly
(12.280 ± 0.007 pc)
Absolute magnitude (MV)5.75[8]
Details
Mass0.871[7] M☉
Radius0.82+0.02
−0.03[3] R☉
Luminosity0.478±0.001[3] L☉
Surface gravity (log g)4.55[7] cgs
Temperature5,303+100
−63[3] K
Metallicity [Fe/H]+0.16[9] dex
Rotation11 days[9]
Rotational velocity (v sin i)2.80[6] km/s
Age3.76[7] Gyr
Other designations
V538 Aur, BD+53°934, GJ 211, HD 37394, HIP 26779, HR 1925, WDS J05413+5329A[10]
Database references
SIMBADdata

V538 Aurigae is a single[11] star in the northern constellation of Auriga. With an apparent visual magnitude of 6.23, this star requires good dark sky conditions to view with the naked eye. It is located at a distance of 40.0 light-years (12.3 pc) from Sun based on parallax. The star is drifting further away with a radial velocity of 0.9 km/s.[7] It is a member of the Local Association,[5] and is most likely a thin disk star.[7]

This is a BY Draconis variable,[6] which means it undergoes changes in luminosity because regions of pronounced surface magnetic activity are moved into and out of the line of sight from the Earth as the star rotates (once every 11 days).[9] It has a spectral class of K1 V, indicating that it is a K-type main sequence star.[5] The star has 87%[7] of the mass of the Sun and 82%[3] of the Sun's radius. It is an estimated 3.76 billion years old.[7] The star is radiating 48% of the Sun's luminosity from its photosphere at an effective temperature of 5,303 K.[3]

It has a common proper motion companion designated Vys 465 (HD 233153),[12] which is a red dwarf with a class of M0.5V and a visual magnitude of 9.87. Their projected separation is 1,204 AU.[13]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Gaidos was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference mnras328_1_45 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference aa547_A106 was invoked but never defined (see the help page).
  7. ^ a b c d e f g h Cite error: The named reference apj764_1_78 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Soderblom1987 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Halbwachs2017 was invoked but never defined (see the help page).