NGC-6522 - AN INTERMEDIATE METALLICITY GLOBULAR-CLUSTER PROJECTED ON THE BAADE WINDOW

We studied NGC 6522 colour magnitude diagrams using CCD photometry wit h BV filters. We have carefully estimated the reddening, which is crit ical for Baade Window studies, obtaining E(B-V) = 0.55. We derive for this intermediate metallicity cluster, a distance of 6.2 kpc, slightly foreground to the bulk of the metal-rich bulge population. The CMD pr operties of the cluster core show an enhanced and extended blue horizo ntal branch, a characteristic in common with many other core collapsed globular clusters.