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Detailed abundances of Red Giants in the Globular Cluster NGC~1851: C+N+O and the Origin of Multiple Populations
Sandro Villanova, Douglas Geisler, Giampaolo Piotto
We present chemical abundance analysis of a sample of 15 red giant branch (RGB) stars of the Globular Cluster NGC~1851 distributed along the two RGBs of the (v, v-y) CMD. We determ…
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…
The helium spread in the Globular cluster 47 Tuc
M. Di Criscienzo, P. Ventura, F. D' Antona +2
Spectroscopy has shown the presence of the CN band dicothomy and the Na-O anticorrelations for 50--70% of the investigated samples in the cluster 47 Tuc, otherwise considered a "no…
The end of the white dwarf cooling sequence in M 67
A. Bellini, L. R. Bedin, G. Piotto +21
In this paper, we present for the first time a proper-motion-selected white dwarf (WD) sample of the old Galactic open cluster M 67, down to the bottom of the WD cooling sequence (…
Chemical composition of stellar populations in Omega Centauri
A. F. Marino, G. Piotto, R. Gratton +5
We derive abundances of Fe, Na, O, and s-elements from GIRAFFE@VLT spectra for more than 200 red giant stars in the Milky Way satellite Omega Centauri. Our preliminary results are…