This the revised program 10832 to move from the ACS/HRC to the WFPC2. The program generates an error window in APT upon submission indicating some kind of unresolved error in the program. However I do not see any errors or warnings being reported in APT. ----- Submission 1 (Tue May 16 02:19:17 GMT 2006) ----- ----- Attempting Submission 2 (Wed Apr 11 13:02:54 GMT 2007) ----- Assigned ID: 143 ----- Submission 1 (Thu Jan 26 22:10:08 GMT 2006) ----- We propose to use the HST WFPC2 (revised from the Advanced Camera for Surveys High Resolution Channel due to the failure of this camera) to obtain high resolution imaging data for 10 bona-fide LMC microlensing events seen in the original MACHO survey. The purpose of this survey will be to assess whether or not the lens and source stars have separated enough to be resolved since the original microlensing event took place - about a decade has passed since the original MACHO survey and the first set of HST WFPC2 follow-up observations of the microlensing events. If the components of the lensing event are resolved, we will determine the apparent magnitude and color of both the lens and the source stars. These data, in combination with Spitzer/IRAC data and Magellan near-IR JHK data, will be used to ascertain the basic properties of the lens stars. With the majority of the microlensing events in the original MACHO survey observed at the highest spatial resolution currently possible, we will be able to draw important conclusions as to what fraction of these events have lenses which belong to some population of dwarf stars in the disk and what fraction must be due to lenses in the halo or beyond. These data will greatly increase our understanding of the structure of the Galaxy by characterizing the stellar population responsible for the gravitational microlensing.

We will use the ACS/HRC with the F606W Broad-V filter and the F814W Broad-I filter to image the fields on and around 10 microlensing events seen towards the LMC in the original MACHO survey. With both filters we will execute a box dither pattern to minimize pixel-based errors, to eliminate transients (cosmic rays), and to do good centroiding. The integration times will be chosen to maximize the signal-to-noise on target, with a desired signal-to-noise of ~100 in the F814W and ~50 in the F606W filters. 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