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Could SiC A+B grains have originated in a post-AGB thermal pulse?

Published online by Cambridge University Press:  26 May 2016

Falk Herwig ,
Sachiko Amari ,
Maria Lugaro  and
Ernst Zinner
Falk Herwig
Affiliation:
University of Victoria, Victoria, BC, Canada
Sachiko Amari
Affiliation:
Washington University, St. Louis, USA
Maria Lugaro
Affiliation:
IoA, University of Cambridge, Cambridge, UK
Ernst Zinner
Affiliation:
Washington University, St. Louis, USA

Abstract

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The carbon and nitrogen isotopic ratios of pre-solar SiC grains of type A+B suggest a proton-limited nucleosynthetic process as encountered, for instance, during the very late thermal pulse of post-AGB stars. We study the nuclear processes during this phase and find carbon and nitrogen isotopic ratios which can reproduce those of A+B grains. These results are still preliminary because they depend on uncertain factors such as the details of mixing during the post-AGB thermal pulse, the rates of some nuclear reactions, and the assumptions on mixing during the progenitor AGB phase.

Type
Part V: Dust and Molecules in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 311 - 312
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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