GP Andromedae
File:GPAndLightCurve.png The visual band light curve of GP Andromedae, shown over one pulsation cycle, adapted from Szeidl et 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−V color 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 to GP And) is a Delta Scuti variable star in the constellation Andromeda.[4] It is a pulsating star, with its brightness varying with an amplitude of 0.55 magnitudes around a mean magnitude of 10.7.[3]
System
[edit | edit source]GP Andromedae is a main sequence Population I star of spectral type A3, placing it in the instability strip of the Hertzsprung-Russell diagram where Delta Scuti variables lay.[3]
A visual companion star 11 arcseconds away, named TYC 1739-1526-2, shares a common proper motion and has a similar distance (measured by parallax) as GP Andromedae.[8] There is no proof, however, that the two stars are gravitationally bound.[9]
Variability
[edit | edit source]The observed variability of GP Andromedae is typical for a Delta 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]
References
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f g h i Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c GP And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
