Omicron Andromedae
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 Location of ο Andromedae (far right) |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 01m 55.2643s |
| Declination | +42° 19′ 33.525″ |
| Apparent magnitude (V) | 3.633 / 3.6 |
| Characteristics | |
| Spectral type | B6 IIIep |
| U−B color index | -0.53 |
| B−V color index | -0.09 |
| Variable type | Eclipsing binary of beta Lyr |
| Astrometry | |
| Radial velocity (Rv) | -14.0 km/s |
| Proper motion (μ) | RA: 22.47 mas/yr Dec.: 0.24 mas/yr |
| Parallax (π) | 4.71 ± 0.67 mas |
| Distance | approx. 690 ly (approx. 210 pc) |
| Details | |
| Radius | 6.6[1] R☉ |
| Luminosity | 1,380[2] L☉ |
| Temperature | 13,800[2] K |
| Rotational velocity (v sin i) | 240[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron Andromedae (ο And, ο Andromedae) is a star system in the constellation Andromeda. It is approximately 692 light years from Earth.
Omicron Andromedae is a binary star, whose two components are both spectroscopic binaries themselves, making a four-star system. The system as a whole is classified as a blue-white B-type giant with a mean combined apparent magnitude of +3.62.
The separation of the two brightest components, ο Andromedae A and ο Andromedae B, is 0.34 arcseconds. They have an orbital period of 68.6 years. A is separated from its spectroscopic companion by 0.05 arcseconds. A is a Gamma Cassiopeiae type variable star and the system's brightness varies from magnitude +3.58 to +3.78. This, in turn, has made determination the orbital period of A's spectroscopic binary difficult. B's spectroscopic companion was discovered in 1989, and that binary has a period of 33.01 years.
[edit] References
- ^ Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode 1979MNRAS.189..601U
- ^ a b c Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society 309 (1): 221-232, Bibcode 1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x
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