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He Abundance in Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

R. Gruenwald  and
S. M. Viegas
R. Gruenwald
Affiliation:
IAG-USP; Av. Miguel Stefano, 4200; 04301-904 São Paulo, SP, Brazil
S. M. Viegas
Affiliation:
IAG-USP; Av. Miguel Stefano, 4200; 04301-904 São Paulo, SP, Brazil

Abstract

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Type I planetary nebulae (PNe), defined as those with high He (and N) abundances, generally present bipolar geometries and high stellar temperatures. The main goal of this paper is to check if the empirically derived He overabundance for Type I PNs is real, or if it is a consequence of geometrical effects due to the bipolarity and/or to the ionization stratification due to the high stellar temperature of these objects.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 480 - 482
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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