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Transport Phenomena and Light Element Abundances in the Sun and Solar Type Stars

Published online by Cambridge University Press:  25 May 2016

Sylvie Vauclair
Sylvie Vauclair*
Affiliation:
Laboratoire d’Astrophysique, 14 av. Ed. Belin, 31400-Toulouse, France

Abstract

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The observations of light elements in the Sun and Solar type stars give special clues for understanding the hydrodynamical processes at work in stellar interiors. In the Sun 7Li is depleted by 140 while 3He has not increased by more than ≅ 10% in 3 Gyrs. Meanwhile the inversion of helioseismic modes lead to a precision on the sound velocity of about 1%. The mixing processes below the solar convection zone are constrained by these observations. Lithium is depleted in most Pop I solar type stars. In halo stars however, the lithium abundance seems constant in the “spite plateau” with no observed dispersion, which is difficult to reconcile with the theory of diffusion processes. In the present paper, the various relevant observations will be discussed. It will be shown that the μ-gradients induced by element settling may help solving the ‘lithium paradox’.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 470 - 475
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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