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Very Low-Mass Stars: structural and evolutionary properties
Santi Cassisi
We briefly review the main physical and structural properties of Very Low-Mass stars. The most important improvements in the physical inputs required for the stellar models computa…
The C+N+O abundance of Omega Centauri giant stars: implications on the chemical enrichment scenario and the relative ages of different stellar populations
A. F. Marino, A. P. Milone, G. Piotto +7
We present a chemical-composition analysis of 77 red-giant stars in Omega Centauri. We have measured abundances for carbon and nitrogen, and combined our results with abundances of…
Stroemgren photometry of the Bulge: the Baade's Window and the globular cluster NGC 6522
A. Calamida, G. Bono, C. E. Corsi +11
We present Ca-uvby Stroemgren photometry of the Baade's Window, including the Galactic globular cluster NGC 6522. We separate field and cluster stars by adopting color-color planes…
On a new theoretical calibration of the Stroemgren hk metallicity index: NGC6522 as a first test case
A. Calamida, G. Bono, C. Corsi +11
We present a new theoretical calibration of the Stroemgren metallicity index hk by using alpha-enhanced evolutionary models transformed into the observational plane by using atmosp…
A Double Main Sequence in the Globular Cluster NGC 6397
A. P. Milone, A. F. Marino, G. Piotto +5
High-precision multi-band HST photometry reveals that the main sequence (MS) of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. Thi…
The ACS LCID project VII: the blue stragglers population in the isolated dSph galaxies Cetus and Tucana
M. Monelli, S. Cassisi, M. Mapelli +8
We present the first investigation of the Blue Straggler star (BSS) population in two isolated dwarf spheroidal galaxies of the Local Group, Cetus and Tucana. Deep HST/ACS photomet…