We derive [ Cu/Fe ] for 117 giant stars in ten globular clusters ( M3 , M4 , M5 , M10 , M13 , M15 , M71 , NGC 7006 , NCG 288 , and NGC 362 ) and find that globular cluster Cu abundances appear to follow [ Cu/Fe ] trends found in the field .
This result is interesting in light of recent work which indicates that the globular cluster \omega Centauri shows no trend in [ Cu/Fe ] with [ Fe/H ] over the abundance range -2.0 < [ Fe/H ] < -0.8 .
Of particular interest are the two clusters M4 and M5 .
While at a similar metallicity ( [ Fe/H ] \sim - 1.2 ) , they differ greatly in some elemental abundances : M4 is largely overabundant in Si , Ba , and La compared to M5 .
We find that it is also overabundant in Cu with respect to M5 , though this overabundance is in accord with [ Cu/Fe ] ratios found in the field .