Nascimbeni, V; Bedin, L R; Heggie, D C; van den Berg, M; Giersz, M; Piotto, G; Brogaard, Karsten; Bellini, A; Milone, Antonino; Rich, R M; Pooley, D
We present the results of a photometric search for variable stars in the core of the Galactic globular cluster Messier 4 (M 4). The input data are a large and unprecedented set of deep Hubble Space Telescope WFC3 images (large programme GO-12911; 120 orbits allocated), primarily aimed at probing binaries with massive companions by detecting their astrometric wobbles. Though these data were not optimized to carry out a time-resolved photometric survey, their exquisite precision, spatial...[Show more]
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