The HST/ACS Survey of Galactic globular clusters is a Treasury project designed to obtain photometry with S/N ≥10 for main sequence stars with masses ≥ 0.2M&sun; in a large sample of globulars using the Advanced Camera for Surveys (ACS) Wide Field Channel. We plan to use these data to address a range of astrophysical questions. Here we present new

Based on our large and homogeneous photometric database of globular cluster observations taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope, a set of distance and reddening independent relative age indicators have been measured. The high quality of the color magnitude diagrams (CMDs) allows us to explore several variations

As part of The HST/ACS Survey of Galactic Globular Cluster, we have imaged the globular clusters that are canonical members of the Sagittarius dSph galaxy (Sgr), including M54, which is either in or along the line of sight of the core of the Sagittarius dSph. The M54 field CMD, which extends to more than five magnitudes below the M54 main sequence

In this paper, we present the astrophotometric catalogues of 56 globular clusters and one open cluster. Astrometry and photometry are mainly based on images collected within the `HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation' (GO-13297, PI: Piotto), and the `ACS Survey of Galactic Globular

We build on the evidence provided by our Legacy Survey of Galactic globular clusters (GC) to submit to a crucial test four scenarios currently entertained for the formation of multiple stellar generations in GCs. The observational constraints on multiple generations to be fulfilled are manifold, including GC specificity, ubiquity, variety

The Instituto de Astrofisica de Canarias (IAC) is a Spanish research centre. It comprises the Instituto de Astrofisica, the main headquarters in La Laguna (Tenerife), the Teide Observatory in Izaña (Tenerife) and the Roque de los Muchachos Observatory, in Garafia on La Palma. Whilst maintaining a level of excellence, not only for the facilities of