Abstract
Consideration is given to the interpretation of the spectra of gaseous nebulae and extended stellar envelopes in terms of electron density and temperature, fluctuations of related parameters, ionic concentrations, and chemical compositions. The calculation of atomic structure, A-values, and other parameters is considered in relation to nebular diagnostics, and diagrams for diagnostic parameters are presented. Observational checks on the theory with respect to the p3 configuration are examined, and the p2 and p4 configurations are also discussed. 41 references.
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