Issue |
Astron. Astrophys. Suppl. Ser.
Volume 145, Number 3, September 2000
|
|
---|---|---|
Page(s) | 451 - 465 | |
DOI | https://doi.org/10.1051/aas:2000356 | |
Published online | 15 September 2000 |
Photometric catalog of nearby globular clusters*
II. A large homogeneous
color-magnitude diagram data-base
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
Send offprint request to: A. Rosenberg, e-mail: alf@ll.iac.es
Received:
24
February
2000
Accepted:
6
June
2000
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 (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
© European Southern Observatory (ESO), 2000