Introduction

To provide reduced stellar photometry of a large subset of ALL HST/WFPC2 observations of Local Group galaxies!

A significant amount of HST time has been spent imaging resolved stellar populations in the Local Group, and these data have provided some of the most accurate measurements of star formation histories, mass functions, and related quantities. However, much of the analysis of these data has been done ``piecemeal'', with different teams proposing observations of different objects and publishing analyses of single fields at a time.

We have undertaken an archival study to compile a homogeneous set of stellar photometry results from a significant fraction of all HST/WFPC2 observations. We:

• use the most up-to-date information on calibration of the instrument, and apply this calibration uniformly to all data sets
• derive the stellar measurements using software designed specifically for analysis of HST/WFPC2 data, namely, HSTPHOT (Dolphin 2000) for all of the data sets, and for a subset of the datasets, special routines in XVISTA (e.g., Holtzman et al 1997). We make special effort to provide quality control of the photometry and provide a comparison of results using the two different, and completely independent, software packages.
• provide information on completeness of the photometry as a function of both brightness and color based on extensive fake star experiments
• provide the output photometry, basic plots of results and quality control results, finder charts for the fields, combined input frames, and links directly to the raw frames in the HST archive in a simple WWW interface
• will use this dataset to approach some global issues in Local Group stellar populations science:

In addition, the compilation in a single location of high quality color-magnitude diagrams of galaxies which exhibit a wide range of star formation histories provides a fascinating educational tool for understanding stellar evolution and the different assembly histories of galaxies.