Bibcode
Rosenberg, A.; Piotto, G.; Saviane, I.; Aparicio, A.
Referencia bibliográfica
Astronomy and Astrophysics Supplement, v.144, p.5-38
Advertised on:
5
2000
Número de citas
86
Número de citas referidas
81
Descripción
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
75% of the known Galactic globulars with (m-M)_V<= 16.15 mag, cover
most of the globular cluster metallicity range (-2.2 <= [Fe/H]<=
-0.4), and span Galactocentric distances from ~ 1.2 to ~ 18.5 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 22nd 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 ~ 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. Based
on data collected at the European Southern Observatory, La Silla, Chile.