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Chemical Compositions of Planetary and Diffuse Nebulae

Published online by Cambridge University Press:  25 April 2016

L. H. Aller
L. H. Aller*
Affiliation:
Physics Department, University of Queensland and Astronomy Department, University of California, Los Angeles
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Extract

Detailed physical mechanisms responsible for excitation of spectral lines in gaseous nebulae have been known for 50 years, and reasonable estimates of nebular densities and temperatures were obtained in the late thirties and early forties. However quantitative chemical analyses have proven difficult partly because of uncertainties in atomic parameters (notably collision strengths) and partly because of complications posed by the nebulae themselves.

Type
Invited Papers
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 3 , 1978 , pp. 213 - 219
Copyright
Copyright © Astronomical Society of Australia 1978

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