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The temperature distribution of horizontal branch stars: methods and first results
E. P. Lagioia, E. Dalessandro, F. R. Ferraro +4
As part of a large project aimed at characterizing the ultraviolet (UV) properties of globular clusters, we present here a theoretical and observational analysis aimed at setting t…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. II. The seven stellar populations of NGC7089 (M2)
A. P. Milone, A. F. Marino, G. Piotto +17
We present high-precision multi-band photometry for the globular cluster (GC) M2. We combine the analysis of the photometric data obtained from the Hubble Space Telescope UV Legacy…
The Na-O anticorrelation in horizontal branch stars. V. NGC 6723
R. G. Gratton, S. Lucatello, A. Sollima +7
We used FLAMES+GIRAFFE (Medusa mode) at the VLT to obtain moderately high resolution spectra for 30 red horizontal branch (RHB) stars, 4 RR Lyrae variables, and 17 blue horizontal…
Observing multiple stellar populations with FORS2@VLT - Main sequence photometry in outer regions of NGC 6752, NGC 6397, and NGC 6121 (M 4)
D. Nardiello, A. P. Milone, G. Piotto +3
We present the photometric analysis of the external regions of three Galactic Globular Clusters: NGC 6121, NGC 6397 and NGC 6752. The main goal is the characterization of the multi…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
G. Piotto, A. P. Milone, L. R. Bedin +23
In this paper we describe a new UV-initiative HST project (GO-13297) that will complement the existing F606W and F814W database of the ACS Globular Cluster (GC) Treasury by imaging…
On the missing second generation AGB stars in NGC6752
Santi Cassisi, Maurizio Salaris, Adriano Pietrinferni +2
[Abridged] In recent years the view of Galactic globular clusters as simple stellar populations has changed dramatically, as it is now thought that basically all GCs host multiple…