The sample

The sample was developed starting from the list of Local Group galaxies provide by Mateo (1998). The HST archive was searched for all WFPC2 observations near the central positions of each galaxy (with a custom search radius for each galaxy). Each group of observations at a common position (allowing for dithering) and position angle and taken within a relatively short period of time (which essentially groups the observations by proposal) was identified and assigned a unique identifier which is the HST program and group ID code.

Fields in each galaxy were grouped into three categories:

1. fields with more than 500s integration in each of F555W and F814W. This is the highest priority category designed to provide at least moderately deep photometry with the most common filter combination
2. fields with more than 500s integration in both of at least two visible broadband filters (F300W, F439W, F450W, F555W, F606W, F814W) which allow the construction of a moderately deep color-magnitude diagram
3. all other fields

If more than two filters were used for any field, reduction was done using all of the available data, so there are many fields already reduced that have observations in more than two filters.

Currently, we have completed an initial round of photometry of almost all of the category 1 fields in all galaxies except for some in the LMC, and have completed category 2 fields in galaxies for which there are no category 1 fields. We anticipate completing all category 1 and 2 fields shortly. We probably will not extend the photometry to include ALL category 3 fields (there are a lot!), but the pipeline can easily be run on any field upon request.