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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…
Membership of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553
P. Coelho, B. Barbuy, M. -N. Perrin +4
Low resolution spectra of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553 are analysed. Radial velocities and atmospheric parameters are derived in order to chec…
An optical and near IR study of the old open cluster NGC 2141
G. Carraro, S. Hassan, S. Ortolani +1
We report on CCD optical (B and V passbands) and near IR (J and K bands) observations in the region of the old open cluster NGC 2141. By combining the two sets of photometry (500 s…
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…
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…