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

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

2000-02-17

arxiv.org/abs/astro-ph/0002351v1

Astronomy and Astrophysics

Astrophysics

to appear in "The Light Elements and their Evolution", ASP conf. Series

Scientific paper

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 mu-gradients induced by element settling may help solving the "lithium paradox".

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