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Metallicities for Double Mode RR Lyrae in the Large Magellanic Cloud
A. Bragaglia, R. G. Gratton, E. Carretta +3
Metallicities for six double mode RR Lyrae's (RRd's) in the Large Magellanic Cloud have been estimated using the DeltaS method. The derived [Fe/H] values are in the range [Fe/H] =…
An abundance analysis for four Red Horizontal Branch Stars in the extremely metal rich globular cluster NGC 6528
Eugenio Carretta, Judith G. Cohen, Raffaele G. Gratton +1
We present the results of the first analysis of high dispersion spectra of four red HB stars in the metal rich globular cluster NGC 6528, located in Baade's Window. We find that th…
The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age
M. Zoccali, A. Renzini, S. Ortolani +9
We present a new determination of the distance (and age) of the Galactic globular cluster 47 Tucanae (NGC 104) based on the fit of its white dwarf (WD) cooling sequence with the em…