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Chemical Abundances in Planetary Nebulae

Published online by Cambridge University Press:  22 September 2016

Manuel Peimbert
Manuel Peimbert*
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México

Abstract

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PN can be divided into four types depending on their chemical composition. In order of decreasing heavy element abundances the types are: I) He and N rich, II) intermediate population, III) high velocity, and IV) halo population. The type II PN are overabundant in N and C relative to the Orion Nebula. Well defined gradients across the galactic disk of He, N and O are derived from type II PN; the oxygen gradient is similar to the metallicity gradient derived from GK giants and F main sequence stars. By comparing the O, Ne and S abundances of PN of types III and IV with the Fe abundances of stars of similar population it is found that the O, Ne and S enrichment in the Galaxy probably took place before the Fe enrichment.

Type
Session V: Chemical Abundances
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 215 - 224
Copyright
Copyright © Reidel 1978 

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