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Multiple stellar populations in the Galactic globular cluster NGC 6752
A. P. Milone, G. Piotto, I. R. King +6
We have carried out high-precision photometry on a large number of archival HST images of the Galactic globular cluster NGC 6752, to search for signs of multiple stellar population…
The bottom of the white dwarf cooling sequence in the old open cluster NGC 2158
L. R. Bedin, M. Salaris, I. R. King +3
We use 10 orbits of Advanced Camera for Surveys observations to reach the end of the white dwarf cooling sequence in the solar-metallicity open cluster NGC 2158. Our photometry and…
Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
E. Carretta, A. Bragaglia, R. G. Gratton +12
We present abundances of Fe, Na, and O for 1409 red giant stars in 15 galactic globular clusters, derived from the homogeneous analysis of high resolution FLAMES/GIRAFFE spectra. C…
The influence of the C+N+O abundances on the determination of the relative ages of Globular Clusters: the case of NGC 1851 and NGC 6121 (M4)
F. D'Antona, P. B. Stetson, P. Ventura +3
The color magnitude diagram (CMD) of NGC 1851 presents two subgiant branches (SGB), probably due the presence of two populations differing in total CNO content. We test the idea th…
BVRIJHK photometry and proper motion analysis of NGC 6253 and the surrounding field
M. Montalto, G. Piotto, S. Desidera +5
Context. We present a photometric and astrometric catalog of 187963 stars located in the field around the old super-metal-rich Galactic open cluster NGC 6253. The total field-of-vi…
A double stellar generation in the Globular Cluster NGC6656 (M 22). Two stellar groups with different iron and s-process element abundance
A. F. Marino, A. P. Milone, G. Piotto +4
AIMS. In this paper we present the chemical abundance analysis from high resolution UVES spectra of seventeen bright giant stars of the Globular Cluster M~22. RESULTS. We obtained…