WFPC2 UV survey of Galactic globular clusters. The Horizontal Branch temperature distribution
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Ultraviolet observations are the best tool to study hot stellar populations which emit most of their light at short wavelengths. As part of a large project devoted to the characterization of the UV properties of Galactic globular clusters (GGCs), we collected mid/far UV and optical images with the WFPC2@HST for 31 GGCs. These clusters cover a wide range in metallicity and structural parameters, thus representing an ideal sample for comparison with theoretical models. Here we present the first results from an ongoing analysis aimed at deriving the temperature distribution of Horizontal Branch stars in GGCs.
KeywordsGlobular clusters: hot stars Horizontal Branch NGC 5139 NGC 6293
This research is part of the project COSMIC-LAB funded by the European Research Council, under contract ERC-2010-AdG-267675.