Lithium abundance and age spread in the Pleiades

Details Lithium abundance and age spread in the Pleiades Lithium abundance and age spread in the Pleiades

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..663d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 663-671.

Astronomy and Astrophysics

Astrophysics

135

Abundance, Lithium, Pleiades Cluster, Star Clusters, Stellar Evolution, Emission Spectra, Line Spectra, Stellar Temperature

Scientific paper

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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