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The bottom of the white dwarf cooling sequence in the old open cluster NGC 2158
L. R. Bedin, M. Salaris, I. R. King +3
We use 10 orbits of Advanced Camera for Surveys observations to reach the end of the white dwarf cooling sequence in the solar-metallicity open cluster NGC 2158. Our photometry and…
Stromgren photometry of Galactic Globular Clusters. II Metallicity distribution of red giants in Omega Centauri
A. Calamida, G. Bono, P. B. Stetson +23
We present new intermediate-band Stroemgren photometry based on more than 300 u,v,b,y images of the Galactic globular cluster Omega Cen. Optical data were supplemented with new mul…
Stellar models: firm evidence, open questions and future developments
Santi Cassisi
During this last decade our knowledge of the evolutionary properties of stars has significantly improved. This result has been achieved thanks to our improved understanding of the…
Li-rich RGB stars in the Galactic Bulge
O. A. Gonzalez, M. Zoccali, L. Monaco +7
We present Lithium abundance determination for a sample of K giant stars in the galactic bulge. The stars presented here are the only 13 stars with detectable Lithium line (6767.18…
Hot Horizontal Branch stars in omega Centauri: clues about their origin from the cluster Color Magnitude Diagram
S. Cassisi, M. Salaris, J. Anderson +5
We investigate a peculiar feature at the hottest, blue end of the horizontal branch of Galactic globular cluster omega Centauri, using the high-precision and nearly complete catalo…
On the metallicity gradient of the Galactic disk
S. Pedicelli, G. Bono, B. Lemasle +15
Aims: The iron abundance gradient in the Galactic stellar disk provides fundamental constraints on the chemical evolution of this important Galaxy component. However the spread aro…