Omicron Aurigae

Omicron Aurigae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension 05h 45m 54.04306s[1]
Declination +49° 49′ 34.6097″[1]
Apparent magnitude (V) +5.47[2]
Characteristics
Spectral type A1 Cr Eu[3]
U−B color index +0.02
B−V color index +0.02[4]
Astrometry
Radial velocity (Rv)−7.7±0.9[5] km/s
Proper motion (μ) RA: −6.97[1] mas/yr
Dec.: −1.22[1] mas/yr
Parallax (π)7.89 ± 0.84 mas[1]
Distanceapprox. 410 ly
(approx. 130 pc)
Absolute magnitude (MV)−0.03[6]
Details
Mass1.9[7] M☉
Radius3.2[7] R☉
Luminosity95[6] L☉
Surface gravity (log g)3.7[7] cgs
Temperature8,660[8] K
Rotational velocity (v sin i)35.2±5.3[7] km/s
Other designations
ο Aur, 27 Aur, BD+49° 1398, FK5 216, HD 38104, HIP 27196, HR 1971, SAO 40583[9]
Database references
SIMBADdata

Omicron Aurigae, Latinized from ο Aurigae, is the Bayer designation for an astrometric binary[10] star system in the northern constellation of Auriga. With an apparent visual magnitude of 5.47,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 7.89 ± 0.84 mas,[1] it is approximately 413 light-years (127 parsecs) distant from Earth. The star is a member of the Ursa Major stream of co-moving stars.[11]

The visible component is a chemically peculiar star with a stellar classification of A1 Cr Eu; meaning this is an A-type star with a spectrum that shows abnormally high abundances of chromium (Cr) and europium (Eu).[3] A magnetic field has been detected and it is a source of X-ray emission with a luminosity of: log Lx = 29.1.[11] It is spinning with a projected rotational velocity of 29 km/s[12] and is radiating 95[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,660 K.[8]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aaa498_3_961 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Deutschman1976 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Moiseeva_et_al_2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2012 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 aj129_5_2420 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Panzera1999 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Royer2002 was invoked but never defined (see the help page).