Abstract

This contribution, presented at the 2016 conference on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas (ASOS12), shows how atomic physics contributes to the interpretation of emission-line spectra observed in astronomical nebulae, and discusses a few unsolved issues where atomic physics may play a role, although other possible explanations are indeed possible. It is limited to the determinations of chemical abundances, the most sought-after information derived from emission lines.

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