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Gas-Phase Abundance Anomalies and the Origin of Planetary Nebulae

Published online by Cambridge University Press:  22 September 2016

G.A. Shields
Affiliation:
University of Texas at Austin
J.M. Scalo
Affiliation:
University of Texas at Austin

Extract

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Six high-excitation PN are found to have gas-phase iron abundances less than solar by M.2 dex, and carbon abundances larger than solar by M3.8 dex. The objects have solar abundances of oxygen, and this supports the idea that the missing iron has condensed into grains. Efficient condensation of iron, and of all carbon not in CO molecules, is expected before the shell becomes ionized. The presence of some gas-phase iron therefore requires partial destruction of the grains.

Type
Session VIII: Planetary Nebulae and Their Influence on the Galaxy
Copyright
Copyright © Reidel 1978