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Deep HST Imaging in NGC 6397: Stellar Dynamics
J. S. Heyl, H. Richer, J. Anderson +9
Multi-epoch observations with ACS on HST provide a unique and comprehensive probe of stellar dynamics within NGC 6397. We are able to confront analytic models of the globular clust…
An Empirical Measure of the Rate of White Dwarf Cooling in 47 Tucanae
R. Goldsbury, J. Heyl, H. B. Richer +8
We present an empirical determination of the white dwarf cooling sequence in the globular cluster 47 Tucanae. Using spectral models, we determine temperatures for 887 objects from…
Stellar Models with Enhanced Abundances of C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti, in Turn, at Constant Helium and Iron Abundances
Don A. VandenBerg, Peter A. Bergbusch, Aaron Dotter +4
Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/F…
The effects of differential reddening and stellar rotation on the appearance of multiple populations in star clusters: the case of Trumpler 20
I. Platais, C. Melo, S. N. Quinn +6
We present a detailed analysis of the upper main sequence of the 1.3 Gyr old open cluster Trumpler 20. High accuracy BV photometry combined with the Very Large Telescope/FLAMES med…