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Disentangling multiple stellar populations in globular clusters using the Strömgren system
J. Alonso-García, M. Catelan, P. Amigo +10
An increasing amount of spectroscopic and photometric evidence is showing that the stellar populations of globular clusters are not as simple as they have been considered for many…
Variable stars in the Globular Cluster NGC 2808
Andrea Kunder, Peter B. Stetson, Marcio Catelan +2
The first calibrated broadband BVI time-series photometry is presented for the variable stars in NGC 2808, with observations spanning a range of twenty-eight years. We have also re…
The Horizontal Branch of NGC 1851: Constraints from its RR Lyrae Variables
Andrea Kunder, Maurizio Salaris, Santi Cassisi +5
We use the pulsational properties of the RR Lyrae variables in the globular cluster NGC 1851 to obtain detailed constraints of the various sub-stellar populations present along its…
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…
On the central helium-burning variable stars of the LeoI dwarf spheroidal galaxy
G. Fiorentino, P. B. Stetson, M. Monelli +3
We present a study of short period, central helium-burning variable stars in the Local Group dwarf spheroidal galaxy LeoI, including 106 RR Lyrae stars and 51 Cepheids. So far, thi…
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…