 Thevisual bandlight curve of GP Andromedae, shown over one pulsation cycle, adapted from Szeidlet al.[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 55m 18.1501s[2] |
| Declination | +23° 09′ 49.3715″[2] |
| Apparent magnitude (V) | 10.7 variable[3] |
| Characteristics | |
| Spectral type | A3[4] |
| Apparent magnitude (B) | 10.96[5] |
| Apparent magnitude (G) | 10.8282[2] |
| Apparent magnitude (J) | 10.071[6] |
| Apparent magnitude (H) | 10.018[6] |
| Apparent magnitude (K) | 9.993[6] |
| B−Vcolor index | 0.164[5] |
| Variable type | Delta Scuti[4] |
| Astrometry | |
| Proper motion (μ) | RA: 25.77±3.38[2]mas/yr Dec.: −0.37±2.58[2]mas/yr |
| Parallax (π) | 1.9355±0.1468 mas[2] |
| Distance | 1,700 ± 100 ly (520 ± 40 pc) |
| Details[7] | |
| Mass | 1.7±0.1 M☉ |
| Radius | 1.72[2] R☉ |
| Luminosity | 9.454[2] L☉ |
| Temperature | 7,718[2] K |
| Age | 13±3 Myr |
| Other designations | |
| 2MASS J00551814+2309494,HIP 4322,TYC 1739-1526-1 | |
| Database references | |
| SIMBAD | data |
GP Andromedae (often abbreviated toGP And) is aDelta Scuti variable star in theconstellationAndromeda.[4] It is a pulsating star, with its brightness varying with an amplitude of 0.55magnitudes around a mean magnitude of 10.7.[3]
GP Andromedae is amain sequence Population I star ofspectral type A3, placing it in the instability strip of theHertzsprung-Russell diagram where Delta Scuti variables lay.[3]
A visual companion star 11arcseconds away, namedTYC 1739-1526-2, shares a common proper motion and has a similar distance (measured byparallax) as GP Andromedae.[8] There is no proof, however, that the two stars are gravitationally bound.[9]
The observed variability of GP Andromedae is typical for aDelta Scuti variable; it's a purely monoperiodic radial pulsating star with a period of 0.0787 days. The period of pulsations is slowly and continuously increasing, matching the predictions of stellar evolution models for Delta Scuti variables.[3]
