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The Abundances of He, N, Ne, Ar and Cl

Published online by Cambridge University Press:  22 September 2016

James B. Kaler
James B. Kaler*
Affiliation:
University of Illinois Observatory

Extract

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Various abundance problems have been well reviewed by the two previous papers. The study of the compositions of planetary nebulae has been quite fruitful. Nebulae can be used to study elements which are difficult to study in stars. In particular, it has been shown that planetaries can contain matter which has undergone nuclear processing, which in turn can enhance the abundances of some elements, notably He and N. In addition, planetaries can be used to study composition gradients in the galaxy. Of particular relevance to these topics are papers by Peimbert and Torres-Peimbert (1971) (hereafter referred to as PTP) and Boeshaar (1975) on enhancement of N/O; by Kaler (1973) on He/H ratios; by Barker (1976) on He and N; by D'Odorico, Peimbert and Sabbadin (1976), Aller (1976) and Torres-Peimbert and Peimbert (1977) (hereafter referred to as TPP) on abundance gradients.

Type
Session V: Chemical Abundances
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 235 - 244
Copyright
Copyright © Reidel 1978 

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