The lithium abundance in stars

Physics

Scientific paper

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Abundance, Giant Stars, Lithium, Main Sequence Stars, Pre-Main Sequence Stars, Subgiant Stars, Big Bang Cosmology, Stellar Temperature

Scientific paper

The lithium abundance determinations in premain-sequence (Population I and II), subgiant, and giant stars are reviewed in order to show how Li can be used as a constraint on stellar hydrodynamics and in particular on particle transport processes in stars. Observations revealed the tight Li abundance dependence on Teff in the Hyades, the time dependence of the Li abundance below Teff = 6000 K, the presence of an Li gap at Teff = 6700 K in young clusters, and the large Li abundance in some peculiar giants. Models including progressively more physical properties are compared to the observed abundances. Li establishes the limits of validity of the standard stellar evolution models. Evolutionary models taking into account diffusion and meridional circulation can clarify most observations. The Li gap is considered to be due to gravitational settling with some probable contribution from meridional circulation.

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