Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..107c&link_type=abstract
Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 107-113. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
11
Astronomical Models, Oxygen Spectra, Planetary Nebulae, Atomic Excitations, Charge Exchange, Computerized Simulation, Density Distribution, Emission Spectra, Gas Ionization, Line Spectra
Scientific paper
Observed line ratios of 12 medium to high excitation ionization bounded planetary nebulae are compared with those predicted from individually constructed ionization models in order to investigate which physical parameters can and must be altered to obtain satisfactory agreement with the observations. A 'standard' model is considered first, consisting of a black body central star surrounded by a spherically symmetric homogeneous nebula. The errors which must be accepted as realistic for O III/O II are discussed. In order to remove the systematic discrepancies between observed line strengths and those predicted from the 'standard' modes, the influence of departures from the stated 'standard' assumptions are studied. Inaccuracies in the charge exchanges coefficients, deviations of the ionizing flux from a black body spectrum, and several varieties of the distribution of gas in the nebular envelope are considered.
Che Aixia
Koeppen Joachim
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