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 \sim 15,000 ) , moderate signal–to–noise ratio ( \langle S/N \rangle \sim 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 } \approx 13.7 provided reasonable surface gravity estimates for the stars in our sample .
Our spectroscopic analysis finds M107 to be moderately metal–poor with \langle [ Fe/H ] \rangle =–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 ( \langle [ Al/Fe ] \rangle =+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 ] \gtrsim –1 .
The cluster also appears to be moderately r– process enriched with \langle [ Eu/La ] \rangle =+0.32 ( \sigma = 0.17 ) .