Journal Article

Lithium depletion in late-type dwarfs

D. R. Xiong and L. Deng

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 4, pages 2013-2028
Published in print June 2009 | ISSN: 0035-8711
Published online May 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14581.x
Lithium depletion in late-type dwarfs

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Using a self-consistent dynamic theory of non-local convection, the atmospheric lithium-abundance depletion values of a series of stellar evolutionary models with are calculated, and the results show that the general observed properties of lithium abundance in lower-main-sequence stars can be reproduced by overshooting mixing and gravitational settling. After a careful study of the mechanisms of lithium depletion in stars, it is concluded that overshooting mixing and microdiffusion induced by gravitational settling and radiative acceleration are the two primary depletion mechanisms: for warm stars with (or ) microdiffusion dominates, while it is the other way round for cooler objects with (or ).

Keywords: convection; stars: abundances; stars: evolution; stars: late-type; open clusters and associations: general

Journal Article.  8910 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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