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Li Abundance in Pop I Stars

Published online by Cambridge University Press:  25 May 2016

Luca Pasquini
Luca Pasquini*
Affiliation:
European Southern Observatory, Karl Schwarzschild Strasse 2 85748 Garching bei München, Germany

Abstract

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The study of Li in Pop I stars has focussed in the last years on observations of open clusters, spanning a large range of ages and metallicities. So far the observational picture is quite complex: the data indicate several phenomena which are not well understood, from the 'Li dip', to the scatter in Li abundances found among (otherwise similar) stars both in young and old clusters. Models fail in reproducing most of the observed features; in particular the almost total lack of dependence of Li depletion with metallicity. The comparison between clusters of different ages show that no PMS depletion occurs, and that for a large fraction of old star no additional depletion occurs after the first ˜1.5 Gyrs, while the depletion is strong at earlier ages. These observations are crucial for our understanding of the relationship between the Pop II Li Plateau and the Li primordial abundance.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 269 - 278
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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