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Title:
News on Deep Mixing
Authors:
Lattanzio, John C.; Dearborn, Davis S. P.; Eggleton, Peter P.
Affiliation:
AA(Centre for Stellar and Planetary Astrophysics, Monash University, Australia), AB(Lawrence Livermore National Laboratory, California, USA), AC(Lawrence Livermore National Laboratory, California, USA)
Publication:
IXTH TORINO WORKSHOP ON EVOLUTION AND NUCLEOSYNTHESIS IN AGB STARS AND THE IIND PERUGIA WORKSHOP ON NUCLEAR ASTROPHYSICS. AIP Conference Proceedings, Volume 1001, pp. 279-286 (2008). (AIPC Homepage)
Publication Date:
04/2008
Origin:
AIP
PACS Keywords:
Stellar structure, interiors, evolution, nucleosynthesis, ages, Giant and subgiant stars, Abundances, chemical composition
DOI:
10.1063/1.2916976
Bibliographic Code:
2008AIPC.1001..279L

Abstract

We briefly summarize the abundant observational evidence for the need of a ``deep mixing'' mechanism in first-ascent red-giant stars, and probably in AGB stars as well. By the term ``deep mixing'' we mean some mixing mechanism which operates in the radiative zone below the convective envelope, and which transports material from the convective region to hotter regions, near the top of the hydrogen shell, where nuclear burning may take place. We then discuss a recent discovery of deep-mixing caused by the burning of 3He following first dredge-up in low-mass stars. This is expected to be a thermohaline process and preliminary calculations show that it has many of the properties required to explain the observations.
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