Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ssrv...57....1m&link_type=abstract
Space Science Reviews (ISSN 0038-6308), vol. 57, July 1991, p. 1-58. Research supported by NSERC and Ministere de l'Education du
Physics
107
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.
Charbonneau Paul
Michaud Georges
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