Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...51..211a&link_type=abstract
Astrophysical Journal Supplement Series, vol. 51, Feb. 1983, p. 211-247.
Astronomy and Astrophysics
Astrophysics
304
Abundance, Astronomical Models, Planetary Nebulae, Chemical Composition, Error Analysis, Galactic Structure, Interstellar Chemistry, Interstellar Gas, Ion Density (Concentration), Ionized Gases, Spectral Line Width
Scientific paper
The chemical compositions of 41 planetary nebulae are established on the basis of an analysis of image tube scanner measurements, supplemented by IUE data. An attempt is made to calculate a theoretical model that gives satisfactory values of the observed intensities, as well as a number of excitation-sensitive ratios, in order to obtain ionization correction factors applicable to the ionic concentrations that will lead to total abundance values. The quality of individual nebular analyses varies, depending on the completeness and accuracy of the observational data and the complexity of the nebular structure. Quality estimates are assigned for each element in each nebula, and an overall reliability index is given to each object. It is concluded that the confidence with which one can speak of the chemical composition of a nebula varies significantly.
Aller Lawrence H.
Czyzak Stanley J.
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