PV Telescopii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 23m 14.6635s |
| Declination | -56° 37′ 44.15″ |
| Apparent magnitude (V) | 9.25 |
| Characteristics | |
| Spectral type | B5p |
| B−V color index | -0.01 |
| 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 ± 1.12 mas |
| Distance | approx. 10,000 ly (approx. 2,000 pc) |
| Absolute magnitude (MV) | -2.25 |
| Details | |
| Mass | 0.9[1] M☉ |
| Radius | 19[2] R☉ |
| Luminosity | ~6,500 L☉ |
| Surface gravity (log g) | 1.5[3] cgs |
| Temperature | 14,000[3] K |
| Metallicity | -0.15[3] |
| Other designations | |
PV Telescopii, PV Tel, HD 168476, HIP 90099. | |
| Database references | |
| SIMBAD | data |
PV Telescopii (also known as HD 168476) is a class B-type (blue) extreme helium star in the constelation Telescopium. It is also the prototype of variable stars called PV Telescopii variables. These are probably post-AGB stars with weak Hydrogen lines and enhanced Helium and Carbon lines. Their variable periods are from a few hours to a few years and as of 2008, there are 12 confirmed PV Telescopii variables. Some researchers have modelled white dwarf mergers as a way to produce these unlikely stars.[4]
References
- ↑ Jeffery, C. S.; Starling, R. L. C.; Hill, P. W.; Pollacco, D. (2001). "Cyclic and secular variation in the temperatures and radii of extreme helium stars". Monthly Notices of the Royal Astronomical Society 321: 111. doi:10.1046/j.1365-8711.2001.03992.x.
- ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition -Comments and statistics". Astronomy and Astrophysics 367 (2): 521. doi:10.1051/0004-6361:20000451.
- ↑ 3.0 3.1 3.2 Soubiran, C.; Le Campion, J. -F.; Cayrel De Strobel, G.; Caillo, A. (2010). "The PASTEL catalogue of stellar parameters". Astronomy and Astrophysics 515: A111. Bibcode:2010A&A...515A.111S. doi:10.1051/0004-6361/201014247.
- ↑ Gourgouliatos, K. N.; Jeffery, C. S. (2006). "On the angular momentum evolution of merged white dwarfs". Monthly Notices of the Royal Astronomical Society 371 (3): 1381. doi:10.1111/j.1365-2966.2006.10780.x.
See also
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