Light Element Settling in Main-Sequence Pop II Stars and the Primordial Lithium Abundance
Abstract
Description
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.
7pages, 5figures, paper given at the LiBeB workshop, IAP, Paris, Dec'98
7pages, 5figures, paper given at the LiBeB workshop, IAP, Paris, Dec'98