Astron. Astrophys. Suppl. Ser. 145, 451-465
A. Rosenberg 1, A. Aparicio2, I. Saviane3, and G. Piotto3
Send offprint request: A. Rosenberg, e-mail: firstname.lastname@example.org
1 - Telescopio Nazionale Galileo, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
2 - Instituto de Astrofisica de Canarias, Via Lactea, E-38200 La Laguna, Tenerife, Spain
3 - Dipartimento di Astronomia, Univ. di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Received February 24; accepted June 6, 2000
The catalog has been collected using only two telescopes (one for each hemisphere). The observed clusters represent of the known Galactic globulars with mag, cover most of the globular cluster metallicity range ( ), and span Galactocentric distances from to 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 magnitudes below the turn-off (i.e. ) 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 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.
Key words: astronomical data base: miscellaneous -- catalogs -- stars: Hertzsprung-Russell (HR) and C-M diagrams -- stars: population II -- globular clusters: general
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