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The metallicity of Palomar 1
A. Rosenberg, G. Piotto, I. Saviane +2
Palomar 1 is a peculiar galactic globular cluster, suspected to be younger than the bulk of the Galactic halo objects. However, such a low age can be confirmed only after a reliabl…
Pal 1: Another Young Galactic Halo Globular Cluster?
A. Rosenberg, I. Saviane, G. Piotto +2
Deep V and I CCD images of the loosely populated Galactic globular cluster Pal 1 and the surrounding field have been obtained with the INT. A color magnitude diagram down to V(lim)…
The Stellar Distribution of the Globular Cluster M55
S. Zaggia, G. Piotto, M. Capaccioli
We have used extensive V, I photometry (down to V=20.9) of 33615 stars in the direction of the globular cluster M55 to study the dynamical interaction of this cluster with the tida…
A Comparison of Deep HST Luminosity Functions of Four Globular Clusters
G. Piotto, A. M. Cool, I. R. King
From deep color-magnitude arrays made from V and I images taken with the Hubble Space Telescope's WFPC2 camera we have determined luminosity functions (LFs) down to a level that co…