| GY Andromedae | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 38m 31.8s |
| Declination | +45° 23′ 59″ |
| Apparent magnitude (V) | 6.36 |
| Characteristics | |
| Spectral type | B9 pCrEu |
| U-B color index | -0.1 |
| B-V color index | 0.04 |
| Variable type | α2 Canum Venaticorum |
| Astrometry | |
| Radial velocity (Rv) | 3 km/s |
| Proper motion (μ) | RA: -16.21 mas/yr Dec.: 0.59 mas/yr |
| Parallax (π) | 7.17 ± 0.85 mas |
| Distance | 455 ly (140 pc) |
| Absolute magnitude (MV) | 0.64 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Metallicity | ? |
| Rotation | 0.051135863788 Year |
| Age | ? years |
| Orbit | |
| Companion | GY Andromedae B |
| Period (P) | 0.7474 yr |
| Inclination (i) | 37.4° |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 465 (GY Andromedae or GY And) is an Alpha2 Canum Venaticorum type variable star in the constellation Andromeda. Its brightness fluctuates between 6.27 mag and 6.41 mag. It belongs to the group of CP stars (chemically peculiar stars). Its most striking characteristic is the occurrence of the element promethium in its emission spectrum. It is also a spectroscopic binary star with a period of almost 273 days and an eccentricity of 0.47.
References
- Aller, M. F. 1971. "Promethium in the star HR465", Sky & Telescope, vol.41, pp.220-222
- Scholz, G., 1978, "Spectroscopic investigations of the magnetic AP star HD 9996", Astronomische Nachrichten, vol. 299, no. 2. pp. 81-85.
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