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Chemical Composition of a Southern Planetary Nebulae Sample

Published online by Cambridge University Press:  07 August 2017

J.A. De Freitas Pacheco  and
R.D.D. Costa
J.A. De Freitas Pacheco
Affiliation:
Instituto Astron⊚mico e Geofísico, Universidade de São Paulo, Brazil
R.D.D. Costa
Affiliation:
Instituto Astron⊚mico e Geofísico, Universidade de São Paulo, Brazil

Abstract

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We report the results of our analysis of a well observed sample of southern planetary nebulae. The average S/O and Ar/O ratios are comparable to the solar value and to those observed in galactic H II regions. The He abundance correlates with the N/O ratio, confirming the trend found by previous studies, indicating the surface contamination of the progenitors by dredge-up episodes.

Type
Near Stellar Environments
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 361 - 362
Copyright
Copyright © Kluwer 1992 

References

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