Chemical Abundances of Red Giant Stars in the Globular Cluster M107 (NGC
  6171)
  We present chemical abundances of Al and several Fe-Peak and neutron-capture
elements for 13 red giant branch stars in the Galactic globular cluster NGC
6171 (M107). The abundances were determined using equivalent width and spectrum
synthesis analyses of moderate resolution (R~15,000), moderate signal-to-noise
ratio (<S/N>~80) spectra obtained with the WIYN telescope and Hydra multifiber
spectrograph. A comparison between photometric and spectroscopic effective
temperature estimates seems to indicate a reddening value of E(B-V)=0.46 may be
more appropriate for this cluster than the more commonly used value of
E(B-V)=0.33. Similarly, we found that a distance modulus of (m-M)V~13.7
provided reasonable surface gravity estimates for the stars in our sample. Our
spectroscopic analysis finds M107 to be moderately metal-poor with <[Fe/H]>=
-0.93 and also exhibits a small star-to-star metallicity dispersion
(sigma=0.04). These results are consistent with previous photometric and
spectroscopic studies. Aluminum appears to be moderately enhanced in all
program stars (<[Al/Fe]>=+0.39, sigma=0.11). The relatively small star-to-star
scatter in [Al/Fe] differs from the trend found in more metal-poor globular
clusters, and is more similar to what is found in clusters with [Fe/H] greater
than about -1. The cluster also appears to be moderately r-process enriched
with <[Eu/La]>=+0.32 (sigma=0.17).
