What question did this study set out to answer?

To create a comprehensive color-magnitude diagram (CMD) database for nearby Galactic globular clusters (GGCs).

Photometric catalog of nearby globular clusters

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Large catalog presents color-magnitude diagrams of 52 globular clusters, indicating new data for researchers.

To create a comprehensive color-magnitude diagram (CMD) database for nearby Galactic globular clusters (GGCs).
Data collected from 52 GGCs in V and I bands using two telescopes, one in each hemisphere.
39 GGCs observed in the southern hemisphere and 13 in the northern hemisphere, reported separately.
Absolute photometric calibration achieved within the mag level for both filters.
CMDs presented for 39 southern hemisphere GGCs, including four first-time CCD data observations.
Catalog spans a wide range of globular cluster metallicities and Galactocentric distances.
Homogeneity of the catalog enables useful measurements of absolute and relative CMD parameters.

Rosenberg et al. (2000) studied this question.

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