EVOLUTION OF THE LITHIUM ABUNDANCES OF SOLAR-TYPE STARS .5. K-DWARFS IN THE HYADES

We have observed a dozen Hyades K dwarfs at high resolution and high signal to noise to see if they show a spread in their Li abundances like the spread seen among Pleiades K dwarfs. We cannot detect a Li feature in these stars, but we see no differences in their spectra at the Li 6708 Angstrom feature that exceed 2 m Angstrom. This suggests the Hyades K dwarfs lack the spread in Li seen in Pleiades K dwarfs, indicating a different history of Li depletion. (C) 1995 American Astronomical Society.