The age of the Sculptor dwarf spheroidal galaxy from imaging with WFPC2

Jackie Monkiewicz, Jeremy R. Mould, John S. Gallagher, John T. Clarke, John T. Trauger, Carl Grillmair, Gilda E. Ballester, Christopher J. Burrows, David Crisp, Robin Evans, Richard Griffiths, J. Jeff Hester, John G. Hoessel, Jon A. Holtzman, John E. Krist, Vicki Meadows, Paul Scowen, Karl R. Stapelfeldt, Ragvendra Sahai, Alan Watson