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The O-Na and Mg-Al Anticorrelations in Turn-Off and early Subgiants in Globular Clusters
R. G. Gratton, P. Bonifacio, A. Bragaglia +16
High dispersion spectra (R>40,000) for a quite large number of stars at the main sequence turn-off and at the base of the subgiant branch in NGC6397 and NGC6752 were obtained with…
Lead: Asymptotic Giant Branch production and Galactic Chemical Evolution
Claudia Travaglio, Roberto Gallino, Maurizio Busso +1
The enrichment of Pb in the Galaxy is followed in the framework of a detailed model of Galactic chemical evolution that already proved adequate to reproduce the chemical enrichment…
Metal Abundances of Red Clump Stars in Open Clusters: I. NGC 6819
A. Bragaglia, E. Carretta, R. G. Gratton +10
We present an analysis of high dispersion spectra (R~40000) of three red clump stars in the old open cluster NGC 6819. The spectra were obtained with SARG, the high dispersion spec…
On the Existence of Differences in Luminosity between Horizontal Branch Stars in Globular Clusters and in the Field
Eugenio Carretta, Raffaele Gratton, Gisella Clementini
The discrepancy between a LONG distance scale derived from Hipparcos based distances to globular clusters via main sequence fitting to local subdwarfs, and a SHORT distance scale d…