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Probing the Galactic Bulge with deep Adaptive Optics imaging: the age of NGC 6440
L. Origlia, S. Lena, E. Diolaiti +4
We present first results of a pilot project aimed at exploiting the potentiality of ground based adaptive optics imaging in the near infrared to determine the age of stellar cluste…
Near-Infrared Photometry of Four Stellar Clusters in the Small Magellanic Cloud
Alessio Mucciarelli, Livia Origlia, Claudia Maraston +1
We present high-quality J, H and K photometry of four Small Magellanic Cloud stellar clusters with intermediate ages in the 1-7 Gyr range (namely NGC 339, 361, 416 and 419) . We ob…
The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud
A. Mucciarelli, E. Carretta, L. Origlia +1
This paper presents the chemical abundance analysis of a sample of 27 red giant stars located in 4 popolous intermediate-age globular clusters in the Large Magellanic Cloud, namely…
A puzzling millisecond pulsar companion in NGC 6266
G. Cocozza, F. R. Ferraro, A. Possenti +5
We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J17013006B in the globular cluster NGC 6266. A relatively bright star with an an…
Another Non-segregated Blue Straggler Population in a Globular Cluster: the Case of NGC 2419
E. Dalessandro, B. Lanzoni, F. R. Ferraro +4
We have used a combination of ACS-HST high-resolution and wide-field SUBARU data in order to study the Blue Straggler Star (BSS) population over the entire extension of the remote…
The Blue Straggler population in the globular cluster M53 (NGC5024): a combined HST, LBT, CFHT study
G. Beccari, B. Lanzoni, F. R. Ferraro +24
We used a proper combination of multiband high-resolution and wide field multi-wavelength observations collected at three different telescopes (HST, LBT and CFHT) to probe Blue Str…
A Correlation between Blue Straggler and Binary Fractions in the core of Galactic Globular Clusters
A. Sollima, B. Lanzoni, G. Beccari +2
Context. Blue Stragglers Stars (BSSs) are thought to form in globular clusters by two main formation channels: i) mergers induced by stellar collisions and ii) coalescence or mass-…
Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
E. Dalessandro, B. Lanzoni, F. R. Ferraro +4
We have used multi-band high resolution HST WFPC2 and ACS observations combined with wide field ground-based observations to study the blue straggler star (BSS) population in the g…
The surprising external upturn of the Blue Straggler radial distribution in M55
B. Lanzoni, E. Dalessandro, S. Perina +4
By combining high-resolution HST and wide-field ground based observations, in ultraviolet and optical bands, we study the Blue Straggler Star (BSS) population of the low density ga…
The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole
B. Lanzoni, E. Dalessandro, F. R. Ferraro +4
We have used a combination of high resolution (HST ACS-HRC, ACS-WFC, and WFPC2) and wide-field (ESO-WFI) observations of the galactic globular cluster NGC 6388 to derive its center…
The Mass Function of omega Centauri down to 0.15 M_s
A. Sollima, F. R. Ferraro, M. Bellazzini
By means of deep FORS1@VLT and ACS@HST observations of a wide area in the stellar system omega Cen we measured the luminosity function of main sequence stars down to R=22.6 and I_{…
The intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud
A. Mucciarelli, L. Origlia, F. R. Ferraro
We present Hubble Space Telescope ACS deep photometry of the intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud. By using this photometric dataset, we have de…
The Rotation of Sub-Populations in omega Centauri
E. Pancino, A. Galfo, F. R. Ferraro +1
We present the first result of the Ital-FLAMES survey of red giant branch (RGB) stars in omega Cen. Radial velocities with a precision of ~0.5 km/s are presented for 650 members of…
A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue Straggler Population
B. Lanzoni, N. Sanna, F. R. Ferraro +7
By combining high-resolution (HST-WFPC2) and wide-field ground based (2.2m ESO-WFI) and space (GALEX) observations, we have collected a multi-wavelength photometric data base (rang…
The Blue Straggler Population of the Globular Cluster M5
B. Lanzoni, E. Dalessandro, F. R. Ferraro +5
By combining high-resolution HST and wide-field ground based observations, in ultraviolet and optical bands, we study the Blue Stragglers Star (BSS) population of the galactic glob…
The chemical evolution of Omega Centauri's progenitor system
D. Romano, F. Matteucci, M. Tosi +5
Chemical evolution models are presented for the anomalous globular cluster Omega Centauri. After demonstrating that the chemical features of Omega Cen can not be reproduced in the…
Near-IR properties of 24 Globular Clusters in the Galactic Bulge
E. Valenti, F. R. Ferraro, L. Origlia
We present near-IR Color-Magnitude Diagrams and physical parameters for a sample of 24 Galactic Globular Clusters toward the Bulge direction. In this paper we discuss the propertie…
High-resolution spectroscopy of RGB stars in the Sagittarius Streams. I. Radial velocities and chemical abundances
L. Monaco, M. Bellazzini, P. Bonifacio +5
Context. The Sagittarius (Sgr) dwarf spheroidal galaxy is currently being disrupted under the strain of the Milky Way. A reliable reconstruction of Sgr star formation history can o…
The radial distribution of blue straggler stars and the nature of their progenitors
M. Mapelli, S. Sigurdsson, F. R. Ferraro +3
The origin of blue straggler stars (BSS) in globular clusters (GCs) is still not fully understood: they can form from stellar collisions, or through mass transfer in isolated, prim…
A population of binaries in the Asymptotic Giant Branch of 47 Tucanae?
Giacomo Beccari, Francesco R. Ferraro, Barbara Lanzoni +1
We have used a set of archived Hubble Space Telescope/ACS images to probe the evolved populations of the globular cluster 47 Tucanae. We find an excess of Asymptotic Giant Branch (…
Deep FORS1 observations of the double Main Sequence of omega Centauri
A. Sollima, F. R. Ferraro, M. Bellazzini +3
We present the results of a deep photometric survey performed with FORS1@VLT aimed at investigating the complex Main Sequence structure of the stellar system omega Centauri. We con…
Detection of a population gradient in the Sagittarius Stream
M. Bellazzini, H. J. Newberg, M. Correnti +2
We present a quantitative comparison between the Horizontal Branch morphology in the core of the Sagittarius dwarf spheroidal galaxy (Sgr) and in a wide field sampling a portion of…
An empirical tool to derive metallicity, reddening and distance for old stellar populations from near IR Color Magnitude Diagrams
F. R. Ferraro, E. Valenti, L. Origlia
We present an empirical method to derive photometric metallicity, reddening and distance to old stellar populations by using a few major features of the Red Giant Branch (RGB) in n…
Red Giant stars in the Large Magellanic Cloud clusters
A. Mucciarelli, L. Origlia, F. R. Ferraro +2
We present deep J,H,Ks photometry and accurate Color Magnitude Diagrams down to K ~18.5, for a sample of 13 globular clusters in the Large Magellanic Cloud. This data set combined…