Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..815p&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astrophysics
70
Abundance, H Ii Regions, Planetary Nebulae, Shock Waves, Line Spectra, Orion Nebula, Solar Neighborhood, Stellar Winds, Supernova Remnants
Scientific paper
Emission lines from H II regions and planetary nebulae are contamiated by shock waves produced by stellar winds and supernova remnants. This effect is studied and it is found that it could be responsible for: (1) the difference between the O/H abundances derived from the O nebular lines coupled with H II region models and those derived from the observed I(4363)/I(5007) ratio; (2) the large t2 values observed in the Orion nebula and M 8; (3) the difference between the stellar and the H II region O/H abundances in the solar neighborhood; (4) the large (S U)/H ratios observed in H II galaxies; and (5) the low O/H ratios and the N/O versus O/H anticorrelation found in Type I PN and shell nebulae around Population I stars.
Fierro Julieta
Peimbert Manuel
Sarmiento Antonio
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