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Lithium Abundances in Main-Sequence F Stars and Sub-Giants

Published online by Cambridge University Press:  25 May 2016

Jose Dias do Nascimento Jr. ,
Sylvie Théado  and
Sylvie Vauclair
Jose Dias do Nascimento Jr.
Affiliation:
Laboratoire d’Astrophysique, 14 av. Ed. Belin, 31400 Toulouse, France
Sylvie Théado
Affiliation:
Laboratoire d’Astrophysique, 14 av. Ed. Belin, 31400 Toulouse, France
Sylvie Vauclair
Affiliation:
Laboratoire d’Astrophysique, 14 av. Ed. Belin, 31400 Toulouse, France

Abstract

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The application to main-sequence stars of the rotation-induced mixing theory in the presence of μ-gradients leads to partial mixing in the lithium destruction region, not visible in the atmosphere. The induced lithium depletion becomes visible in the sub-giant phase as soon as the convective zone deepens enough. This may explain why the observed ‘lithium dilution’ is smoother and the final dilution factor larger than obtained in standard models, while the lithium abundance variations are very small on the main sequence.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 478 - 479
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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