Light Element Settling in Main-Sequence Pop II Stars and the Primordial Lithium Abundance

Details Light Element Settling in Main-Sequence Pop II Stars and the Primordial Lithium Abundance Light Element Settling in Main-Sequence Pop II Stars and the Primordial Lithium Abundance

1999-02-09

arxiv.org/abs/astro-ph/9902144v1

Astronomy and Astrophysics

Astrophysics

7pages, 5figures, paper given at the LiBeB workshop, IAP, Paris, Dec'98

Scientific paper

While theoretical computations of the lithium abundances in Pop II stars predict variations from star to star, the most recent observations confirm the existence of a "lithium plateau" with no abundance dispersion. This apparent paradox has to be faced and a solution has to be found before deriving the primordial lithium abundance. In any case lithium 7 has been depleted in these stars by at least 20 percent and lithium 6 by at least a factor 2, even in the hottest stars of the "plateau". Consequences for other elements are also discussed.

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