This paper presents a detailed description of the acquisition and processing of a large body of imaging data for three fields in the globular cluster M4 taken with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. Analysis with the ALLFRAME package yielded the deepest photometry yet obtained for this cluster. The resulting data-set for 4708 stars (positions and calibrated photometry in V, I, and, in two fields, U) spanning approximately six cluster core radii is available on the AAS CD-ROM (or email a request to RAI). The scientific analysis is deferred to three companion papers, which investigate the significant white dwarf population discovered and the main sequence population.
@article{arxiv.astro-ph/9805183,
title = {HST Photometry of the Globular Cluster M4},
author = {Rodrigo A. Ibata and Harvey B. Richer and Gregory G. Fahlman and Michael Bolte and Howard E. Bond and James E. Hesser and Carlton Pryor and Peter B. Stetson},
journal= {arXiv preprint arXiv:astro-ph/9805183},
year = {2007}
}
Comments
14 pages, 7 figures, accepted for publication in ApJS