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Comparative Absorption and Emission Abundance Analyses of Nebulae: Ion Emission Densities for IC 418

Jenkins, Edward B.; Williams, Robert; Baldwin, Jack A. +1 more

Recent analyses of nebular spectra have resulted in discrepant abundances from CNO forbidden and recombination lines. We consider independent methods of determining ion abundances for emission nebulae, comparing ion emission measures with column densities derived from resonance absorption lines viewed against the central star continuum. Separate a…