229 citations · 2.7k across the 108 of their papers we have counts for
5 papers · 2 filters
On the origin of the helium-rich population in the peculiar globular cluster Omega Centauri
D. Romano, M. Tosi, M. Cignoni +3
In this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue main sequence (bMS) of the Galactic globular cluster Omega Centauri. In a scenari…
On the origin of the helium-rich population in Omega Centauri
D. Romano, M. Tosi, M. Cignoni +3
To study the possible origin of the huge helium enrichment attributed to the stars on the blue main sequence of Omega Centauri, we make use of a chemical evolution model that has p…
Star formation histories of dwarf galaxies from the Colour-Magnitude diagrams of their resolved stellar populations
Michele Cignoni, Monica Tosi
In this tutorial paper we summarize how the star formation (SF) history of a galactic region can be derived from the colour-magnitude diagram (CMD) of its resolved stars. The proce…
Star Formation History of the SMC: six HST/ACS
E. Sabbi, J. S. Gallagher, M. Tosi +9
We observed six fields of the Small Magellanic Cloud (SMC) with the Advanced Camera for Survey on board the Hubble Space Telescope in the F555W and F814W filters. These fields samp…
Star formation history in the SMC: the case of NGC602
M. Cignoni, E. Sabbi, A. Nota +9
Deep HST/ACS photometry of the young cluster NGC 602, located in the remote low density "wing" of the Small Magellanic Cloud, reveals numerous pre-main sequence stars as well as yo…