Lithium-Rich Field Giants in the Sloan Digital Sky Survey
  We present a search for post-main-sequence field stars in the Galaxy with
atypically large lithium abundances. Using moderate-resolution spectra taken as
part of the Sloan Digital Sky Survey, along with high-resolution followup
spectroscopy from the Hobby-Eberly Telescope, we identify 23 post-turnoff stars
with log epsilon(Li) greater than 1.95, including 14 with log epsilon(Li) > 2.3
and 8 with log epsilon(Li) > 3.0, well above the low level expected for evolved
stars. Comparison with theoretical isochrones indicates that some of our
Li-rich stars are affiliated with the upper red giant branch, the asymptotic
giant branch and the red clump rather than the RGB bump, which is a challenge
to existing models of Li production in evolved stars.
