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Old open clusters and the Galactic metallicity gradient: Berkeley 20, Berkeley 66, and Tombaugh 2
Gloria Andreuzzi, Angela Bragaglia, Monica Tosi +1
To study the crucial range of Galactocentric distances between 12 and 16 kpc, where little information is available, we have obtained VI CCD imaging of Berkeley 20 and BVI CCD imag…
Mining SDSS in search of Multiple Populations in Globular Clusters
C. Lardo, M. Bellazzini, E. Pancino +3
Several recent studies have reported the detection of an anomalous color spread along the red giant branch (RGB) of some globular clusters (GC) that appears only when color indices…
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…
On the radial distribution of stars of different stellar generations in the globular cluster NGC 3201
Eugenio Carretta, Angela Bragaglia, Valentina D'Orazi +2
We study the radial distribution of stars of different stellar generations in the globular cluster NGC 3201. From recently published multicolour photometry, a radial dependence of…
Detailed abundances of a large sample of giant stars in M 54 and in the Sagittarius nucleus
E. Carretta, A. Bragaglia, R. G. Gratton +7
Homogeneous abundances of light elements, alpha and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in M54, a massive globular cluster (G…