Spectrophotometric survey of southern planetary nebulae. III - Automatic ionization modelling

Details Spectrophotometric survey of southern planetary nebulae. III - Automatic ionization modelling Spectrophotometric survey of southern planetary nebulae. III - Automatic ionization modelling

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..184s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 184-194.

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31

Photoionization, Planetary Nebulae, Stellar Spectrophotometry, Abundance, Astronomical Models, Computational Astrophysics, Southern Sky, Stellar Spectra, Stellar Temperature

Scientific paper

Spectra of a sample of 57 high excitation galactical planetary nebulae are analyzed by constructing individual photoionization models. A comparison of our results with those obtained from plasma diagnostics techniques shows that the two methods produce similar results. The average abundances of He, N, O, S, and Ar derived for the 57 objects agree well with the results of Aller and Keyes (1987). Using a statistical distance scale, the galactic abundance gradients from type II planetary nebulae are determined. For galactocentric distances between 1 and 11 kpc, a clear negative He gradient is detected; N, S, and Ar, have similarly strong (-0.08 dex/kpc) gradients, whereas the O gradient is flatter and also less well defined. THe remaining scatter in the N abundance is much larger than in O, S, or Ar, indicating a widely varying nitrogen production in type II planetary nebulae, most probably due to the wide range of progenitor masses.

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