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astro-ph2001★ 47 cited
HST NICMOS Photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4
S. Ortolani, B. Barbuy, E. Bica +4
We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the fi…
astro-ph2001★ 110 cited
The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age
M. Zoccali, A. Renzini, S. Ortolani +9
We present a new determination of the distance (and age) of the Galactic globular cluster 47 Tucanae (NGC 104) based on the fit of its white dwarf (WD) cooling sequence with the em…
astro-ph2001★ 2 cited
The Proper Motion of the Globular Cluster NGC 6553 and of Bulge Stars with HST
M. Zoccali, A. Renzini, S. Ortolani +2
WFPC2 images obtained with the Hubble Space telescope 4.16 years apart have allowed us to measure the proper motion of the metal rich globular cluster NGC 6553 with respect to the…