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Lithium in the Hyades. I - New observations
Thorburn, J. A.; Hobbs, L. M.; Deliyannis, Constantine P.; Pinsonneault, M. H.
AA(Yerkes Observatory, Williams Bay, WI), AB(Yerkes Observatory, Williams Bay, WI), AC(Hawaii Univ., Honolulu), AD(Yale University., New Haven, CT)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 150-173. (ApJ Homepage)
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NASA/STI Keywords:
Lithium, Main Sequence Stars, Metallicity, Open Clusters, Stellar Structure, Spectral Line Width, Stellar Evolution
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Results are presented of new observations, carried out at Li 6707 A, on 68 main-sequence members of the Hyades cluster with spectral types ranging from late F to and early K, and their surface lithium abundance Li/H is related to their mass, age, and initial composition. It is found that, for the sample as a whole, the observed distribution of lithium abundances is inconsistent with the hypothesis of a unique relationship between lithium abundance and mass. Moreover, is strong observational evidence for main-sequence lithium depletion when the data are compared with observations in younger clusters, even for masses that are not predicted to experience such depletion in standard stellar models.

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