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The C+N+O abundance of Omega Centauri giant stars: implications on the chemical enrichment scenario and the relative ages of different stellar populations
A. F. Marino, A. P. Milone, G. Piotto +7
We present a chemical-composition analysis of 77 red-giant stars in Omega Centauri. We have measured abundances for carbon and nitrogen, and combined our results with abundances of…
The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence
A. P. Milone, G. Piotto, L. R. Bedin +15
The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. We investigate the properties of main-sequen…
Multiple stellar populations in 47 Tucanae
A. P. Milone, G. Piotto, L. R. Bedin +16
We use Hubble Space Telescope (HST) and ground-based imaging to study the multiple populations of 47 Tuc, combining high-precision photometry with calculations of synthetic spectra…
Luminosity and mass functions of the three main sequences of the globular cluster NGC 2808
A. P. Milone, G. Piotto, L. R. Bedin +5
High-precision HST photometry has recently revealed that the globular cluster (GC) NGC 2808 hosts a triple main sequence (MS) corresponding to three stellar populations with differ…