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Na-O anticorrelation and HB. IX. Kinematics of the program clusters. A link between systemic rotation and HB morphology?
M. Bellazzini, A. Bragaglia, E. Carretta +4
We use accurate radial velocities for 1981 member stars in 20 Galactic globular clusters, collected within our large survey aimed at the analysis of the Na-O anti-correlation, to s…
The Na-O anticorrelation in horizontal branch stars. I. NGC 2808
R. G. Gratton, S. Lucatello, E. Carretta +3
Globular clusters have been recognized to host multiple stellar populations. A spectacular example of this is the massive cluster NGC2808, where multiple populations have been foun…
A Stromgren view of the multiple populations in globular clusters
Eugenio Carretta, Angela Bragaglia, Raffaele Gratton +2
We discuss a variety of photometric indices assembled from the uvby Stromgren system. Our aim is to examine the pros and cons of the various indices to find the most suitable one(s…
Chemical enrichment mechanisms in Omega Centauri: clues from neutron-capture elements
Valentina D'Orazi, Raffaele Gratton, Elena Pancino +4
In the complex picture of multiple stellar populations in globular clusters (GCs), a special role is played by NGC 5139 Omega Centauri. At variance with the majority of GCs, Omega…
Three new bricks in the wall: Berkeley 23, Berkeley 31, and King 8
Michele Cignoni, Giacomo Beccari, Angela Bragaglia +1
A comprehensive census of Galactic open cluster properties places unique constraints on the Galactic disc structure and evolution. In this framework we investigate the evolutionary…