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The infrared JHK light curves of RR Lyr
A. Sollima, C. Cacciari, A. A. Arkharov +4
We present infrared JHK time series photometry of the variable star RR Lyr, that allow us to construct the first complete and accurate infrared light curves for this star. The deri…
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…
Modeling the chemical evolution of Omega Centauri using three-dimensional hydrodynamical simulations
A. Marcolini, A. Sollima, A. D'Ercole +2
We present a hydrodynamical and chemical model for the globular cluster Omega Cen, under the assumption that it is the remnant of an ancient dwarf spheroidal galaxy (dSph), the bul…
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 fraction of binary systems in the core of thirteen low-density Galactic globular clusters
A. Sollima, G. Beccari, F. R. Ferraro +2
We used deep observations collected with ACS@HST to derive the fraction of binary systems in a sample of thirteen low-density Galactic globular clusters. By analysing the color dis…