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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…
Multiple stellar populations in the globular cluster NGC 1851
Eugenio Carretta, Sara Lucatello, Raffaele Gratton +2
[Abridged] Detailed chemical tagging of individual stellar populations in the Galactic globular cluster (GC) NGC 1851 is presented. Abundances are derived from FLAMES spectra for t…
Multiple populations in Omega Centauri: a cluster analysis of spectroscopic data
Raffaele Gratton, Christian I. Johnson, Sara Lucatello +2
Omega Cen is composed of several stellar populations. Their history might allow us to reconstruct the evolution of this complex object. We performed a statistical cluster analysis…
The debris disk host star HD 61005: a member of the Argus Association?
S. Desidera, E. Covino, S. Messina +6
HD 61005 is a nearby young solar type star that shows a large infrared excess due to a debris disk. The disk has been recently imaged from ground and space, with indications of sev…