The Effect of Metallicity on Surface Lithium Abundance in Hyades-Aged Open Clusters

Details The Effect of Metallicity on Surface Lithium Abundance in Hyades-Aged Open Clusters The Effect of Metallicity on Surface Lithium Abundance in Hyades-Aged Open Clusters

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5838g&link_type=abstract

American Astronomical Society, AAS Meeting #211, #58.38; Bulletin of the American Astronomical Society, Vol. 39, p.840

Astronomy and Astrophysics

Astronomy

Scientific paper

Two of the most important predictions from standard stellar evolution theory about the lithium depletion of solar-type F and G dwarfs are that it occurs primarily during the pre-main sequence and that it depends on metallicity. Abundant evidence from star clusters shows that Li depletion does indeed occur during the pre-main sequence, but then also continues during the main sequence, perhaps due to the effects of (non-standard) rotationally-induced or wave-induced mixing. However, little is known about whether Li depletion depends on metallicity. To test the predicted dependence of standard Li depletion on metallicity, a program has begun that compares the Li-Teff relation in Hyades-aged clusters of different metallicities. Here, we present high resolution results from WIYN/Hydra observations of IC 4756. We find, first, that our data qualitatively support the prediction that stars with higher metallicity have depleted more Li. Second, if a reasonable adjustment is made to the (unknown) initial cluster Li abundances that is consistent with knowledge of Galactic Li production from the field dwarf Li-Fe relation, then our data are also in good quantitative agreement with the metallicity-dependence of the Li depletion from standard theory. This work has been supported by the National Science Foundation under grants AST-0452975 and AST-0206202.

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