Galactic ring nebulae associated with Wolf-rayet stars. IV. The ring nebula S 308 and its interstellar environment.
Abstract
Narrow-band filter photographs, O III 5007 A Fabry-Perot forbidden line profiles, and 21-cm maps of the vicinity of the Sharpless H II region S308 and adjacent nebulae have been obtained. S308 is a ring nebula surrounding the WN5 star HD 50896. An expansion velocity of 60 km/sec, and an age of 70,000 years, are derived for S308. The total kinetic energy and thermal energy in the shell of S308 can account for only 5 percent of the total stellar wind energy input. The H II regions S303 and S304 exterior to S308 are also excited by the star HD 50896, showing that S308 is optically thin to UV photons.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1982
- DOI:
- Bibcode:
- 1982ApJ...254..562C
- Keywords:
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- Galactic Structure;
- Nebulae;
- Ring Structures;
- Spectral Line Width;
- Wolf-Rayet Stars;
- Fabry-Perot Spectrometers;
- Forbidden Transitions;
- H Ii Regions;
- H Lines;
- Interstellar Gas;
- Oxygen Spectra;
- Stellar Winds;
- Astrophysics