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We exploit the large number of archival HST images of 47 Tuc to examine itssubgiant branch (SGB) and main sequence (MS) for signs of multiple populations.In the cluster core, we find that the cluster's SGB exhibits a clear spread inluminosity, with at least two distinct components: a brighter one with a spreadthat is real but not bimodal, and a second one about 0.05 mag fainter,containing about 10% of the stars. In a less crowded field 6 arcminutes fromthe center, we find that the MS is broadened much more than can be accountedfor by photometric errors, and that this broadening increases at faintermagnitudes.

Mixed Populations in Globular Clusters: Et Tu, 47 Tuc?