APOGEE Chemical Abundances of Globular Cluster Giants in the Inner
  Galaxy
  We report chemical abundances obtained by SDSS-III/APOGEE for giant stars in
five globular clusters located within 2.2 kpc of the Galactic centre. We detect
the presence of multiple stellar populations in four of those clusters (NGC
6553, NGC 6528, Terzan 5, and Palomar 6) and find strong evidence for their
presence in NGC 6522. All clusters present a significant spread in the
abundances of N, C, Na, and Al, with the usual correlations and
anti-correlations between various abundances seen in other globular clusters.
Our results provide important quantitative constraints on theoretical models
for self-enrichment of globular clusters, by testing their predictions for the
dependence of yields of elements such as Na, N, C, and Al on metallicity. They
also confirm that, under the assumption that field N-rich stars originate from
globular cluster destruction, they can be used as tracers of their parental
systems in the high- metallicity regime.
