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Discovery of another peculiar radial distribution of Blue Stragglers in Globular Clusters: The case of 47 Tuc
Francesco R. Ferraro, Giacomo Beccari, Robert T. Rood +3
We have used high resolution WFPC2-HST and wide field ground-based observations to construct a catalog of blue straggler stars (BSS) in the globular cluster 47 Tuc spanning the ent…
The puzzling dynamical status of the core of the globular cluster NGC 6752
F. R. Ferraro, A. Possenti, E. Sabbi +4
We have used high resolution WFPC2-HST and ground based Wide Field images to determine the center of gravity and construct an extended radial density and brightness profile of the…
Age and Abundance Discrimination in Old Stellar Populations Using Mid-Ultraviolet Colors
Ben Dorman, Robert W. O'Connell, Robert T. Rood
The restframe mid-ultraviolet spectral region (2000-3200 A) is important in analyzing the stellar populations of the "red envelope" systems observed at high redshifts. Here, we exp…
Blue Horizontal Branch Stars in Old, Metal-Rich Stellar Systems
Ruth C. Peterson, Bruce W. Carney, Ben Dorman +5
Twenty years ago, Burstein et al. (1984)suggested that strong CN and Hbeta absorption meant younger ages among globular clusters in the Andromeda galaxy (M31), unless blue stars ab…
Blue Straggler Stars: a direct comparison of Star counts and population ratios in six Galactic Globular Clusters
Francesco R. Ferraro, Alison Sills, Robert T. Rood +2
The central regions of six Galactic Globular Clusters (GGCs) (M3, M80, M10, M13, M92 and NGC 288) have been imaged using HST-WFPC2 and the ultraviolet (UV) filters (F255W, F336W).…