Abundances of extragalactic globular clusters

Our results are based on spectra obtained with the SCORPIO multislit spectrograph at the 6-m telescope of the Russian Academy of Sciences. We include in our analysis high-quality Hubble Space Telescope/WFPC2 photometry of individual stars in the studied GCs to investigate the influence of their horizontal branch (HB) morphology on the spectroscopic analysis.

All our sample GCs appear to be old (T>8Gyr) and metal-poor ([Z/H]<1.1), except for the GCs Hubble V in NGC 205 (T=1.2+/-0.6Gyr, [Z/H]=0.6+/-0.2), Hubble VI in NGC 205 (T=4+/-2Gyr, [Z/H]=0.8+/-0.2) and FJJVII in NGC 185 (T=7+/-3Gyr, [Z/H]=0.8+/-0.2). The majority of our GCs sample has solar [alpha/Fe] enhancement in contrast to the halo population of GCs in M31 and the Milky Way. The HB morphologies for our sample GCs follow the same behaviour with metallicity as younger halo Galactic GCs.