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Evolution and Mixing on the Agb

Published online by Cambridge University Press:  12 April 2016

John C. Lattanzio
John C. Lattanzio*
Affiliation:
Institute of Geophysics and Planetary Physics, Lawrence LivermoreNational Laboratory, L-413, P.O. Box 808, Livermore, Ca., 94550

Abstract

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It is now well known that Nature can make Carbon stars at lower luminosities than can (human) theorists. A number of workers, stimulated by this challenge, have been attracted to the problem. In this paper I review recent evolutionary models of relatively low mass AGB stars, with emphasis placed on the mixing of carbon to the stellar surface. In particular I discuss some recent improvements in the physics used to construct stellar models. These topics include: breathing pulses of the convective core found during core helium exhaustion; the effects of carbon recombination; the occurrence of semiconvection in the region between the two nuclear burning shells; and the importance of mass loss. Recent calculations have successfully produced models of low luminosity Carbon stars. The strengths and weaknesses of these models will be contrasted.

Type
3. Evolution of Peculiar Red Giant Stars
Information
International Astronomical Union Colloquium , Volume 106: Evolution of Peculiar Red Giant Stars , 1989 , pp. 161 - 175
Copyright
Copyright © Cambridge University Press 1989

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