EO Aurigae
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.
| 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] |
| Characteristics | |
| Spectral type | B3V + B3V[3] |
| U−B color index | −0.63[2] |
| B−V color index | 0.08[2] |
| Variable type | Algol variable |
| Astrometry | |
| 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 |
| Distance | approx. 1,500 ly (approx. 500 pc) |
| Details | |
| EO Aur A | |
| Mass | 6.22±0.73[5] M☉ |
| Luminosity (bolometric) | 2,784[5] L☉ |
| Temperature | 13,360[5] K |
| Age | 23.6±8.0[3] Myr |
| EO Aur B | |
| Mass | 5.00±2.57[5] M☉ |
| Luminosity (bolometric) | 1377[5] L☉ |
| Temperature | 11,650[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- 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
- 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
- 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 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
- Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
- 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
- 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.
- 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
External links
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