STELLAR PHOTOMETRY INCLUDING SATURATED IMAGES - RESULTS ON M67 WITH WFPC2

The Wide Field and Planetary Camera 2 (WFPC2) on HST is providing unsu rpassed imaging capabilities and supporting accurate stellar photometr y over large fields of view at high angular resolution. I discuss a fe ature of the WFPC2 CCD systems that nominally limits the dynamic range attainable with single exposures: a 12 bit analog to digital converte r that does not allow sampling of the CCD full-well depth even at the low gain (14e-/DN) setting. I demonstrate that accurate stellar photom etry can be performed on stellar images that are strongly saturated. T wo 40 s exposures in V and I bands on the old open cluster M67 are ana lyzed to demonstrate photometric capabilities with a dynamic range of over 12 mag from single exposures. New photometric results for both br ight and faint objects in M67 are derived from the WFPC2 data.