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Title:
Lithium abundance and age spread in the Pleiades
Authors:
Duncan, D. K.; Jones, B. F.
Affiliation:
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Lick Observatory, Santa Cruz, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 663-671. (ApJ Homepage)
Publication Date:
08/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Lithium, Pleiades Cluster, Star Clusters, Stellar Evolution, Emission Spectra, Line Spectra, Stellar Temperature
DOI:
10.1086/161233
Bibliographic Code:
1983ApJ...271..663D

Abstract

Surface lithium abundance, a parameter which usually decreases with age in late-type stars, has been determined for Pleiades stars as cool as T(e) approximately 4700 K and Hyades stars as cool as T(e) approximately 5000 K. A large abundance spread is seen among the coolest Pleiades stars, consistent with their having been formed over an interval as long as 0.4 x 10 to the 9th yr, several times longer than the nuclear age of the cluster. Observations of the strength of the Ca II H and K line emission in three of the Pleiades stars also indicate a significant spread in age. Some Pleiades stars as cool as T(e) approximately 5200 K have primordial Li abundances, in conflict with the predictions of pre-main-sequence stellar evolution calculations, indicating that such calculations probably overestimate the importance of convection.

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