PV Telescopii
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 23m 14.66390s |
| Declination | −56° 37′ 44.1512″ |
| Apparent magnitude (V) | 9.30(9.24 - 9.40) |
| Characteristics | |
| Spectral type | B5p |
| U−B color index | −0.60 |
| B−V color index | −0.10 |
| Variable type | PV Tel |
| Astrometry | |
| Radial velocity (Rv) | -169 km/s |
| Proper motion (μ) |
RA: 0.38 mas/yr Dec.: -9.29 mas/yr |
| Parallax (π) | 0.43 ± 1.12mas |
| Distance | 8,000pc |
| Absolute magnitude (MV) | −4.4 |
| Details | |
| Mass | 0.94 M☉ |
| Radius | 33.9 R☉ |
| Luminosity | 25,000 L☉ |
| Surface gravity (log g) | 1.35 cgs |
| Temperature | 12,425 K |
| Metallicity | -0.15 |
| Other designations | |
| Database references | |
| SIMBAD | data |
PV Telescopii (also known as HD 168476) is a class B-type (blue) supergiant extreme helium star in the constellation Telescopium. It is also the prototype of variable stars called PV Telescopii variables.
PV Telescopii shows radial velocity changes thought to be due to radial pulsations caused by a strange mode instability It appears as a star of magnitude 9.3. Despite a mass thought to be less than the sun, it is actually around 25,000 more luminous. The spectrum shows a strong hydrogen deficiency and strongly enhanced helium and carbon lines.
PV Telescopii variables are helium supergiants which vary somewhat irregularly over about 0.1 magnitude on a time-scale of hours to days. PV Telescopii is an example with variations over a few days, 8–10 days being typically quoted. It may be a late thermal pulse post-AGB star or the result of a white dwarf merger.
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