Other
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254...50b&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 50-69. Research supported by the University of Michigan and Alfred P.
Other
163
Abundance, Andromeda Galaxy, H Ii Regions, Nebulae, Spectrophotometry, Stellar Evolution, Supernova Remnants, Astronomical Models, Interstellar Gas, Nitrogen, Oxygen Spectra, Spectrum Analysis, Spiral Galaxies, Tables (Data)
Scientific paper
Eleven H II region spectra and those of six previously reported supernova remnants (SNRs) in M31 are obtained, along with the abundances of the H II regions. It is found that both N and O abundances decrease by a factor of approximately four, from the innermost regions studied, at about 4 kpc, to the outer regions, at about 23 kpc. These gradients are similar to those of other intermediate and late-type spiral galaxies, and the mean N and S abundances are similar to those of the Orion Nebula. The mean oxygen abundance, however, is found to be higher by a factor of two, accounting for the low excitation of the M31 H II regions. While a comparison of SNR and H II region abundance gradients shows agreement for nitrogen, contradictory results are found for oxygen which may be due to problems with the shock models.
Blair William Patrick
Chevalier Roger A.
Kirshner Robert P.
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