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He Abundance in Planetary Nebulae
Published online by Cambridge University Press: 25 May 2016
Abstract
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