| |
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h01m 45.9729s[2] |
| Declination | −03° 45′ 40.6279″[2] |
| Apparent magnitude (V) | 14.9[3] |
| Astrometry | |
| Proper motion (μ) | RA: −14.213±0.155[2] mas/yr Dec.: −3.260±0.064[2] mas/yr |
| Parallax (π) | 1.8131 ± 0.0821 mas[2] |
| Distance | 1,800 ± 80 ly (550 ± 20 pc) |
| Details | |
| Mass | 0.63[4] M☉ |
| Radius | 0.0254 ± 0.005[5] R☉ |
| Luminosity (bolometric) | 200[5] L☉ |
| Surface gravity (log g) | 7.59[4] cgs |
| Temperature | 136,000[4] K |
| Other designations | |
GW Vir, GW Virginis, 2E 2572, WD 1159-034 | |
| Database references | |
| SIMBAD | data |
PG 1159-035 is the prototypical PG 1159 star after which the class of PG 1159 stars was named. It was discovered in the Palomar-Green surveyofultraviolet-excess stellar objects[6] and, like the other PG 1159 stars, is in transition between being the central star of a planetary nebula and being a white dwarf.[7]
The luminosity of PG 1159-035 was observed to vary in 1979,[8] and it was given the variable star designation GW Vir in 1985.[9] Variable PG 1159 stars may be called GW Vir stars, or the class may be split into DOV and PNNV stars.[10][11] The variability of PG 1139-035, like that of other GW Vir stars, arises from non-radial gravity wave pulsations within itself.[12] Its light curve has been observed intensively by the Whole Earth Telescope over a 264-hour period in March 1989, and over 100 of its vibrational modes have been found in the resulting vibrational spectrum, with periods ranging from 300 to 1,000 seconds.[13] [14]
