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Reduce, reuse, recycle: Planetary nebulae as green galactic citizens

Published online by Cambridge University Press:  30 August 2012

Karen B. Kwitter  and
Richard B. C. Henry
Karen B. Kwitter
Affiliation:
Astronomy Department, Williams College, 33 Lab Campus Drive, Williamstown, MA 01267USA email: kkwitter@williams.edu
Richard B. C. Henry
Affiliation:
H. L. Dodge Department of Physics and Astronomy, University of Oklahoma, Nielsen Hall, Norman, OK 73019USA email: henry@nhn.ou.edu
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Abstract

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We review gas-phase abundances in PNe and describe their dual utility as archives of original progenitor metallicity via the α elements, as well as sources of processed material from nucleosynthesis during the star's evolution, i.e., C, N, and s-process elements. We describe the analysis of PN spectra to derive abundances and discuss the discrepancies that arise from different choices at each step. Abundance results for the Milky Way and Magellanic Clouds from various groups of investigators are presented; the observational results are compared with theoretical predictions of AGB stellar yields. Finally, we suggest areas where more work is needed to improve our abilities to determine abundances in PNe.

Keywords

Magellanic cloudsplanetary nebulae: generalstars: abundancesstars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 119 - 126
Copyright
Copyright © International Astronomical Union 2012

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