The Chemical Abundances of Stars in the Halo (CASH) Project. II. A
  Sample of 16 Extremely Metal-poor Stars
  We present a comprehensive abundance analysis of 20 elements for 16 new
low-metallicity stars from the Chemical Abundances of Stars in the Halo (CASH)
project. The abundances have been derived from both Hobby-Eberly Telescope High
Resolution Spectrograph snapshot spectra (R~15,000) and corresponding
high-resolution (R~35,000) Magellan MIKE spectra. The stars span a metallicity
range from [Fe/H] from -2.9 to -3.9, including four new stars with [Fe/H]<-3.7.
We find four stars to be carbon-enhanced metal-poor (CEMP) stars, confirming
the trend of increasing [C/Fe] abundance ratios with decreasing metallicity.
Two of these objects can be classified as CEMP-no stars, adding to the growing
number of these objects at [Fe/H]<-3. We also find four neutron-capture
enhanced stars in the sample, one of which has [Eu/Fe] of 0.8 with clear
r-process signatures. These pilot sample stars are the most metal-poor
([Fe/H]<-3.0) of the brightest stars included in CASH and are used to calibrate
a newly-developed, automated stellar parameter and abundance determination
pipeline. This code will be used for the entire ~500 star CASH snapshot sample.
We find that the pipeline results are statistically identical for snapshot
spectra when compared to a traditional, manual analysis from a high-resolution
spectrum.
