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Title:
Lithium in the Hyades. I - New observations
Authors:
Thorburn, J. A.; Hobbs, L. M.; Deliyannis, Constantine P.; Pinsonneault, M. H.
Affiliation:
AA(Yerkes Observatory, Williams Bay, WI), AB(Yerkes Observatory, Williams Bay, WI), AC(Hawaii Univ., Honolulu), AD(Yale University., New Haven, CT)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 150-173. (ApJ Homepage)
Publication Date:
09/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Lithium, Main Sequence Stars, Metallicity, Open Clusters, Stellar Structure, Spectral Line Width, Stellar Evolution
DOI:
10.1086/173152
Bibliographic Code:
1993ApJ...415..150T

Abstract

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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