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Parameters on single Wolf-Rayet stars.
Among 157 known galactic WR stars 70 are WC, 81 - WN, 2 - WO and 4 -intermediate type Wolf-Rayet stars (WN stars with comparatively stronglines of carbon ions). Among these 157 WR stars 31 have absorption linesof a second component (OB star) in the spectrum. Effective temperaturesare: Teff ≈ 30000 - 50000K for WN8 - WN3 stars andTeff ≈ 20000 - 50000K for WC9 - WC5 stars. Mass loss ratesof WR stars are high: M≈ 2×10-5 -2×10-4M_sun;/y. Chemical composition is abnormal and onthe HR diagram the early subtype WR stars are situated to the left andthe late subtype WR stars to the right from the position ofmain-sequence O-stars. The masses of WR stars lie within the limits M =5 - 50 M_sun;.
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Osservazione e dati astrometrici
| Costellazione: | Cassiopea |
| Ascensione retta: | 01h06m58.42s |
| Declinazione: | +50°35'09.9" |
| Magnitudine apparente: | 7.849 |
| Distanza: | 308.642 parsec |
| Moto proprio RA: | 6.2 |
| Moto proprio Dec: | -6 |
| B-T magnitude: | 9.643 |
| V-T magnitude: | 7.998 |
Cataloghi e designazioni:
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