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The M4 Core Project with HST --- I. Overview and First-Epoch
L. R. Bedin, J. Anderson, D. C. Heggie +14
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observ…
HST absolute Proper Motions of NGC 6681 (M70) and the Sagittarius Dwarf Spheroidal Galaxy
Davide Massari, Andrea Bellini, Francesco R. Ferraro +4
We have measured absolute proper motions for the three populations intercepted in the direction of the Galactic globular cluster NGC 6681: the cluster itself, the Sagittarius dwarf…
Local Group and Star Cluster Dynamics from HSTPROMO (The Hubble Space Telescope Proper Motion Collaboration)
Roeland P. van der Marel, Jay Anderson, Andrea Bellini +17
The Hubble Space Telescope (HST) has proven to be uniquely suited for the measurement of proper motions (PMs) of stars and galaxies in the nearby Universe. Here we summarize the ma…
Time-resolved Spectroscopy of the Polar EU Cancri in the Open Cluster Messier 67
Kurtis A. Williams, Steve B. Howell, James Liebert +4
We present time-resolved spectroscopic and polarimetric observations of the AM Her system EU Cnc. EU Cnc is located near the core of the old open cluster Messier 67; new proper mot…
The intriguing stellar populations in the globular clusters NGC 6388 and NGC 6441
A. Bellini, G. Piotto, A. P. Milone +8
NGC 6388 and NGC 6441 are two massive Galactic bulge globular clusters which share many properties, including the presence of an extended horizontal branch (HB), quite unexpected b…
HST Proper Motions of Stars within Globular Clusters
Andrea Bellini, Roeland P. van der Marel, Jay Anderson
The stable environment of space makes HST an excellent astrometric tool. Its diffraction-limited resolution allows it to distinguish and measure positions and fluxes for stars all…