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astro-ph2003
Accurate Internal Proper Motions of Globular Clusters
L. R. Bedin, G. Piotto, J. Anderson +1
We have undertaken a long term program to measure high precision proper motions of nearby Galactic globular cluster (GC) stars using multi-epoch observations with the WFPC2 and the…
astro-ph2003
HST astrometry: the Galactic constant Theta_0/R_0
L. R. Bedin, G. Piotto, I. R. King +1
From multi-epoch WFPC2/HST observations we present astrometric measurements of the absolute motion of the bulge stars. The presence of an extragalactic point-source candidate allow…