EO Aurigae

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EO Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 18m 21.06592s[1]
Declination +36° 37′ 55.3517″[1]
Apparent magnitude (V) 7.71[2]
Spectral type B3V + B3V[3]
U−B color index −0.63[2]
B−V color index 0.08[2]
Variable type Algol variable
Radial velocity (Rv)-1.1[4] km/s
Proper motion (μ) RA: −1.67±1.71[1] mas/yr
Dec.: −3.33±0.75[1] mas/yr
Parallax (π)2.12 ± 1.15[1] mas
Distanceapprox. 1,500 ly
(approx. 500 pc)
EO Aur A
Mass6.22±0.73[5] M
Luminosity (bolometric)2,784[5] L
Temperature13,360[5] K
Age23.6±8.0[3] Myr
EO Aur B
Mass5.00±2.57[5] M
Luminosity (bolometric)1377[5] L
Temperature11,650[5] K
Other designations
BD+36° 1073, HD 34333, HIP 24744, SAO 57857.
Database references

EO Aurigae is an eclipsing binary of Algol type in the northern constellation of Auriga. With a combined apparent magnitude of 7.71,[2] it is too faint to be seen with the unaided eye.

The eclipsing binary nature of the star was detected in 1943 by Sergei Gaposchkin at Harvard College Observatory,[6] it consists of a pair of B-type main sequence stars orbiting each other with a period of 4.0656 days. During the eclipse of the primary star, the combined magnitude drops by 0.57; the eclipse of the secondary component drops the magnitude by 0.33.[7]


  1. ^ a b c d e van Leeuwen, F. (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. Vizier catalog entry
  2. ^ a b c d Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
  3. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  4. ^ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
  5. ^ a b c d e f Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355
  6. ^ Gaposchkin, Sergei (1943). "A New Bright Eclipsing Variable of Large Mass, HV 10327". Publications of the Astronomical Society of the Pacific. 55 (325): 192–194. Bibcode:1943PASP...55..192G. doi:10.1086/125543.
  7. ^ Malkov, O. Yu.; et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics, 446 (2): 785–789, Bibcode:2006A&A...446..785M, doi:10.1051/0004-6361:20053137

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