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On the magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters
Santi Cassisi, Antonio Marin-Franch, Maurizio Salaris +3
We present new measurements of the magnitude of the main sequence turn off and the red giant branch bump in the luminosity function of a sample of Galactic globular clusters with u…
Period Change Similarities among the RR Lyrae Variables in Oosterhoff I and Oosterhoff II Globular Systems
Andrea Kunder, Alistair Walker, Peter B. Stetson +9
We present period change rates (dP/dt) for 42 RR Lyrae variables in the globular cluster IC4499. Despite clear evidence of these period increases or decreases, the observed per…
The ACS LCID project. VI. The SFH of the Tucana dSph and the relative ages of the isolated dSph galaxies
M. Monelli, C. Gallart, S. L. Hidalgo +10
We present a detailed study of the star formation history (SFH) of the Tucana dwarf spheroidal galaxy. High quality, deep HST/ACS data, allowed us to obtain the deepest color-magni…
The peculiar Horizontal Branch of NGC 2808
E. Dalessandro, M. Salaris, F. R. Ferraro +5
We present an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the…
Abundances for a large sample of red giants in NGC 1851: hints for a merger of two clusters?
E. Carretta, R. G. Gratton, S. Lucatello +8
We present the abundance analysis of a sample of more than 120 red giants in the globular cluster (GC) NGC 1851, based on FLAMES spectra. We find a small but detectable metallicity…
X-shooter observations of main sequence stars in the globular cluster NGC 2808: first chemical tagging of a He-normal and a He-rich dwarf
A. Bragaglia, E. Carretta, R. G. Gratton +7
We present the first chemical composition study of two unevolved stars in the globular cluster NGC 2808, obtained with the spectrograph X-shooter@VLT. NGC 2808 shows three discrete…