Photometric catalog of nearby globular clusters - II. A large homogeneous (V, I) color-magnitude diagram data-base

In this paper we present the second and final part of a large and photometrically homogeneous CCD color-magnitude diagram (CMD) data base, comprising 52 nearby Galactic globular clusters (GGC) imaged in the V and I bands. The catalog has been collected using only two telescopes tone for each hemisphere). The observed clusters represent 75% of the known Galactic globulars with (m - M)(v) less than or equal to 16.15 mag, cover most of the globular cluster metallicity range (-2.2 less than or equal to [Fe/H] less than or equal to -0.4), and span Galactocentric distances from similar to 1.2 to similar to 18.5 kpc. In particular, here we present the CMDs for the 13 GGCs observed in the Northern hemisphere. The remaining 39 Southern hemisphere clusters of the catalog have been presented in a companion paper (Rosenberg et al. 2000). We present the first CCD color magnitude diagram for NGC 6779 (M 56). All the CMDs extend from at least similar to 2 magnitudes below the turn-off (i.e. V-lim greater than or equal to 22) to the tip of the red giant branch. The calibration has been done using a large number of standard stars, and the absolute calibration is reliable to a similar to 0.02 mag level in both filters. This catalog, because of its homogeneity, is expected to represent a useful data base for the measurement of the main absolute and relative parameters characterizing the CMD of GGCs.