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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…
The connection between missing AGB stars and extended horizontal branches
R. G. Gratton, V. D'Orazi, A. Bragaglia +2
Recent surveys confirm early results about a deficiency or even absence of CN-strong stars on the asymptotic giant branch (AGB) of globular clusters (GCs), although with quite larg…
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…
Diluting the material forming the second generation stars in Globular Clusters: the contribution by unevolved stars
Raffaele G. Gratton, Eugenio Carretta
In this short communication we consider the possibility that stars less evolved than the polluters are the source of the dilution needed to explain the observed composition of seco…
Ba stars and other binaries in first and second generation stars in globular clusters
Valentina D'Orazi, Raffaele Gratton, Sara Lucatello +3
The determination of the Ba abundance in globular cluster (GC) stars is a very powerful test to address several issues in the framework of multiple population scenarios. We measure…
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…