EO Aurigae
Eclipsing binary star of Algol type in the constellation Auriga
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EO Aurigae is an eclipsing binary of Algol type in the northern constellation of Auriga. With a combined apparent magnitude of 7.71,[3] it is too faint to be seen with the unaided eye.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 18m 21.0672s[2] |
| Declination | +36° 37′ 55.362″[2] |
| Apparent magnitude (V) | 7.71[3] |
| Characteristics | |
| Spectral type | B3V + B3V[4] |
| Apparent magnitude (G) | 7.69[2] |
| U−B color index | −0.63[3] |
| B−V color index | 0.08[3] |
| Variable type | Algol variable |
| Astrometry | |
| Radial velocity (Rv) | -1.1[5] km/s |
| Proper motion (μ) | RA: −0.479±0.034[2] mas/yr Dec.: −2.954±0.026[2] mas/yr |
| Parallax (π) | 0.9420±0.0306 mas[2] |
| Distance | 3,500 ± 100 ly (1,060 ± 30 pc) |
| Details | |
| EO Aur A | |
| Mass | 6.22±0.73[6] M☉ |
| Luminosity (bolometric) | 2,784[6] L☉ |
| Temperature | 13,360[6] K |
| Age | 23.6±8.0[4] Myr |
| EO Aur B | |
| Mass | 5.00±2.57[6] M☉ |
| Luminosity (bolometric) | 1,377[6] L☉ |
| Temperature | 11,650[6] K |
| Other designations | |
| BD+36° 1073, HD 34333, HIP 24744, SAO 57857, Gaia DR3 187043317482036224. | |
| Database references | |
| SIMBAD | data |
The eclipsing binary nature of the star was detected in 1943 by Sergei Gaposchkin at Harvard College Observatory.[7] 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.[8]
