Detailed chemical abundances for five stars in two Galactic globular clusters , NGC 5466 and NGC 5024 , are presented from high resolution optical ( from the Hobby-Eberley Telescope ) and infrared spectra ( from the SDSS-III APOGEE survey ) .
We find [ Fe/H ] = -1.97 \pm  0.13 dex for NGC 5466 , and [ Fe/H ] = -2.06 \pm  0.13 dex for NGC 5024 , and the typical abundance pattern for globular clusters for the remaining elements , e.g. , both show evidence for mixing in their light element abundance ratios ( C , N ) , and AGB contributions in their heavy element abundances ( Y , Ba , and Eu ) .
These clusters were selected to examine chemical trends that may correlate them with the Sgr dwarf galaxy remnant , but at these low metallicities no obvious differences from the Galactic abundance pattern are found .
Regardless , we compare our results from the optical and infrared analyses to find that oxygen and silicon abundances determined from the infrared spectral lines are in better agreement with the other alpha-element ratios and with smaller random errors .