284 citations · 1.2k across the 37 of their papers we have counts for
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The contribution of faint AGNs to the ionizing background at z~4
A. Grazian, E. Giallongo, K. Boutsia +21
Finding the sources responsible for the hydrogen reionization is one of the most pressing issues in cosmology. Bright QSOs are known to ionize their surrounding neighborhood, but t…
On the impact of Helium abundance on the Cepheid Period-Luminosity and Wesenheit relations and the Distance Ladder
R. Carini, E. Brocato, G. Raimondo +1
This work analyses the effect of the Helium content on synthetic Period-Luminosity Relations (PLRs) and Period-Wesenheit Relations (PWRs) of Cepheids and the systematic uncertainti…
Variable stars and stellar populations in Andromeda XXV: III. A central cluster or the galaxy nucleus?
Felice Cusano, Alessia Garofalo, Gisella Clementini +8
We present B and V time-series photometry of Andromeda XXV, the third galaxy in our program on the Andromeda's satellites, that we have imaged with the Large Binocular Cameras of t…
A bag of tricks: Using proper motions of Galactic stars to identify the Hercules ultra-faint dwarf galaxy members
M. Fabrizio, G. Raimondo, E. Brocato +13
Hercules is the prototype of the ultra-faint dwarf (UFD) galaxies. To date, there are still no firm constraints on its total luminosity, due to the difficulty of disentangling Herc…
Models for the lithium abundances of multiple populations in globular clusters and the possible role of the Big Bang lithium
F. D'Antona, A. D'Ercole, R. Carini +2
Globular cluster stars show chemical abundance patterns typical of hot-CNO processing. Lithium is easily destroyed by proton capture in stellar environments, so its abundance may b…
The role of super-asymptotic giant branch ejecta in the abundance patterns of multiple populations in globular clusters
Annibale D'Ercole, Francesca D'Antona, Roberta Carini +2
In order to account for the chemical composition of a stellar second generation (SG), Globular Clusters (GCs) evolution models based on the asymptotic giant branch (AGB) scenario s…
Terzan 5: an alternative interpretation for the split horizontal branch
F. D'Antona, P. Ventura, V. Caloi +4
We consider the horizontal branch (HB) of the Globular Cluster Terzan 5, recently shown to be split into two parts, the fainter one (delta M_K ~ 0.3mag) having a lower metallicity…