Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........3k&link_type=abstract
Ph.D. Thesis California Univ., Los Angeles.
Physics
16
Planetary Nebulae, Stellar Spectra, Stellar Spectrophotometry, Wolf-Rayet Stars, H Ii Regions, Helium, Interstellar Gas, Nitrogen, Stellar Mass, Stellar Winds
Scientific paper
Spectrophotometric observations of four ring nebulae surrounding population I Wolf-Rayet stars and four additional filamentary nebulae are analyzed in order to determine the physical conditions and chemical abundances in these objects. It is concluded that the ring nebuale are enriched in nitrogen and helium as a result of contamination of the ambient interstellar medium by the helium- and nitrogen-rich wind from the central Wolf-Rayet star. Two of the additional nebulae are found to be Peimbert Type I planetary nebulae, overabundant in nitrogen and helium due to mixing of CNO processed material into the parent envelope prior to ejection. Two of the remaining objects, a shell around an Oef star and a small H II region around an early Be star, exhibit normal abundances. For two of the ring nebulae, the fraction of nebular mass contributed by the central star from published stellar abundances is estimated. It is found that in these cases, the stellar wind has provided less than 10% of the observed nebular mass.
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