CAPOS: the bulge Cluster APOgee Survey. Preliminary abundance analysis of the metal-rich bulge globular cluster NGC 6304

Abstract

The main focus of our research is to perform an abundance analysis of the bulge globular clusters (BGCs) NGC 6304, NGC 6642, Terzan 9 and NGC 6293, in order to determine their detailed chemical composition and study the relationship between BGCs and their counterparts of the halo and disc. Moreover, we also investigate chemical patterns that allow us to study the Multiple Populations (MPs) phenomenon in one of the most-metal rich (NGC6304) GCs of the Galaxy. This analysis is being carried out with a 27 members spectroscopic sample obtained by CAPOS, which uses the unique advantages of APOGEE-2S, the first high-resolution (R: 22,500) near-IR spectrograph in the south. We used BACCHUS to obtain abundances for 18 chemical species, using both atmospheric parameters from ASPCAP and those derived independently from photometry (Gaia + 2MASS). We compare ASPCAP and photometric parameters, derive mean abundances, and investigate MPs.