Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..230h&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 230-238.
Astronomy and Astrophysics
Astrophysics
70
Emission Spectra, Line Spectra, Milky Way Galaxy, Nebulae, Stellar Spectrophotometry, Wolf-Rayet Stars, Forbidden Bands, Gas Ionization, H Alpha Line, Interstellar Gas, Nitrogen Ions, Oxygen Ions, Photoionization, Stellar Envelopes, Stellar Evolution, Sulfur
Scientific paper
A comprehensive narrow band emission line survey of the Milky Way is used in searching for nebulosities surrounding Wolf-Rayet stars. Fifteen ring nebulae are definitely identified, including five previously unreported shell structures. An additional 30 nebulosities are classified as 'probable' or 'possible' ring nebulae. Angular diameter, sharpness or diffuseness, and level of brightness in three emission line bandpasses are determined for each nebulosity detected. Five selected shell structures are discussed in detail. Analysis of these data reveals a tendency for nebulae surrounding early WN stars to be brighter in the forbidden O III than in H-alpha plus the forbidden N II, whereas nebulae surrounding late WN stars tend to be brighter in H-alpha plus the forbidden N II than in the forbidden O III.
Bruhweiler Fred C.
Gull Ted R.
Heckathorn J. N.
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