524 citations · 535 across the 18 of their papers we have counts for
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The Red Giant Branch Bump
M. Riello, G. Piotto, A. Recio-Blanco +2
We present a comparison between theoretical models and the observed magnitude difference between the horizontal branch and the red giant branch bump for a sample of 53 clusters. We…
Rotation of Hot Horizontal Branch Stars in Galactic Globular Clusters
A. Recio-Blanco, G. Piotto, A. Aparicio +1
We present high resolution UVES+VLT spectroscopic observations of 61 stars in the extended blue horizontal branches of the Galactic globular clusters NGC 1904 (M79), NGC 2808, NGC…
Hot Stellar Populations in Globular Clusters: a Photometrist's View
G. Piotto
We briefly review the recent results on hot horizontal-branch stars in globular clusters. Since the first Ivanfest, in 1992, there have been a number of new observational lines of…
Statistical Study of the Blue Straggler Properties in Galactic Globular Clusters
Francesca De Angeli, Giampaolo Piotto
In this paper we report on the most significant results from a statistical analysis of the main properties of globular cluster blue straggler stars (BSS) extracted from the HST sna…
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…
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…