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Dredge-Up in Asymptotic Giant Branch Stars

Published online by Cambridge University Press:  25 May 2016

N. Mowlavi
N. Mowlavi*
Affiliation:
Observatoire de Genève, CH-1290 Versoix, Switzerland

Abstract

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The third dredge-up phenomenon in asymptotic giant branch stars, responsible for the formation of C stars, is discussed based on detailed evolutionary model calculations. The structural readjustment of the star as dredge-up proceeds is analyzed, and its consequences on dredge-up predictions discussed. The question of how to obtain dredge-up in asymptotic giant branch models is also addressed. It is stressed, in particular, that the modeling of dredge-up requires some sort of extra-mixing to be applied below the envelope if the local Schwarzschild criterion is used to delimit convective zones.

Type
Part 1. Basic Facts, Structure, Evolution, Nucleosynthesis
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 47 - 52
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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