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We present new identifications of five red giant stars in the Galactic halowith chemical abundance patterns that indicate they originally formed inglobular clusters. Using data from the Apache Point Observatory GalacticEvolution Experiment (APOGEE) Survey available through Sloan Digital Sky SurveyData Release 12 (DR12), we first identify likely halo giants, and then searchthose for the well-known chemical tags associated with globular clusters,specifically enrichment in nitrogen and aluminum. We find that 2% of the halogiants in our sample have this chemical signature, in agreement with previousresults. Following the interpretation in our previous work on this topic, thiswould imply that at least 13% of halo stars originally formed in globularclusters. Recent developments in the theoretical understanding of globularcluster formation raise questions about that interpretation, and we concede thepossibility that these migrants represent a small fraction of the halo field.There are roughly as many stars with the chemical tags of globular clusters inthe halo field as there are in globular clusters, whether or not they areaccompanied by a much larger chemically untaggable population of formerglobular cluster stars.

Chemical tagging in the SDSS-III/APOGEE survey: new identifications of halo stars with globular cluster origins