High Resolution Spectroscopic Abundances of Red Giant Branch Stars in
  NGC 6681
  We obtain high resolution spectra of nine red giant branch stars in NGC 6681
and perform the first detailed abundance analysis of stars in this cluster. We
confirm cluster membership for these stars based on consistent radial
velocities of 214.5$\pm$3.7 km/s and find a mean [Fe/H] = -1.63$\pm$0.07 dex
and [{\alpha}/Fe] = 0.42$\pm$0.11 dex. Additionally, we confirm the existence
of a Na-O anti-correlation in NGC 6681 and identify two populations of stars
with unique abundance trends. With the use of HST photometry from Sarajedini et
al. (2007) and Piotto et al. (2015) we are able to identify these two
populations as discrete sequences in the cluster CMD. Although we cannot
confirm the nature of the polluter stars responsible for the abundance
differences in these populations, these results do help put constraints on
possible polluter candidates.
