Astron. Astrophys. Suppl. Ser. 144, 5-38
A. Rosenberg 1 - G. Piotto 2 - I. Saviane 2 - A. Aparicio 3
Send offprint request: A. Rosenberg: alf@iac.es
1 -
Telescopio Nazionale Galileo,
vicolo dell'Osservatorio 5, I-35122 Padova, Italy
2 -
Dipartimento di Astronomia, Univ. di Padova,
vicolo dell'Osservatorio 5, I-35122 Padova, Italy
3 -
Instituto de Astrofisica de Canarias,
Via Lactea, E-38200 La Laguna, Tenerife, Spain
Received July 29, 1999; accepted January 25, 2000
We present the first part of the first large and homogeneous CCD
color-magnitude diagram (CMD) data base, comprising 52 nearby Galactic
globular clusters (GGC) imaged in the V and I bands 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 this paper, the CMDs for the 39 GGCs observed in the southern
hemisphere are presented. The remaining 13 northern hemisphere
clusters of the catalog are presented in a companion paper. For
four clusters (NGC 4833, NGC 5986, NGC 6543, and NGC 6638) we present
for the first time a CMD from CCD data. The typical CMD span from the
V magnitude to the tip of the red giant branch. Based on a
large number of standard stars, the absolute photometric calibration
is reliable to the
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-Russel (HR) -- stars: population II -- globular clusters: general
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