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11 papers · 1 filter
Optical/near-infrared colours of early-type galaxies and constraints on their star formation histories
P. A. James, M. Salaris, J. I. Davies +2
(abridged) We introduce and discuss the properties of a theoretical (B-K)-(J-K) integrated colour diagram for single-age, single-metallicity stellar populations. This combination o…
Reddening distribution across the center of the globular cluster Omega Centauri
A. Calamida, P. B. Stetson, G. Bono +17
We present new medium-band uvby Stromgren and broad-band VI photometry for the central regions of the globular cluster Omega Cen. From this photometry we have obtained differential…
Near-Infrared Observations of RR Lyrae Variables in Centauri
M. Del Principe, A. M. Piersimoni, J. Storm +6
We present Near-Infrared (NIR) and -band observations for 181 RR Lyrae stars in the Galactic Globular Cluster Cen. The comparison between predicted and empirical slope…
RR Lyrae variables in Galactic Globular Clusters: distribution of periods and synthetic models
M. Castellani, V. Castellani, S. Cassisi +1
We present some applications of our Synthetic Horizontal Branches (SHB) simulations, aimed to reproduce the peculiar period distributions of RR Lyrae belonging to the Galactic Glob…
Classical Cepheids as Age Indicators
M. Marconi, G. Bono, F. Caputo +3
Theoretical Period-Age and Period-Age-Color relations for different chemical compositions have been recently derived using an updated homogeneous set of evolutionary and pulsationa…
BASTI: An interactive database of updated stellar evolution models
S. Cassisi, A. Pietrinferni, M. Salaris +3
We present a new database of stellar evolution models for a large range of masses and chemical compositions, based on an up-to-date theoretical framework. We briefly discuss the ph…
Evolutionary and structural properties of mirror star MACHOs
Zurab Berezhiani, Paolo Ciarcelluti, Santi Cassisi +1
There can exist a hidden sector of the Universe in the form of parallel ''mirror'' world which has the same particle physics as the observable world and interacts with the latter o…
Stellar evolutionary models: uncertainties and systematics
S. Cassisi
In this last decade, our knowledge of evolutionary and structural properties of stars of different mass and chemical composition is significantly improved. This result has been ach…
On the Horizontal Branch of the Galactic Globular NGC2808
V. Castellani, G. Iannicola, G. Bono +3
We present new UV (F218W) data for stars in the central region of the Galactic globular cluster NGC2808, collected with the WFPC2 camera on board of the Hubble Space Telescope. The…
Color--Magnitude Diagrams and Luminosity Functions down to the Hydrogen Burning Limit. III. A Preliminary HST Study of NGC6791
I. R. King, L. R. Bedin, G. Piotto +3
Using HST ACS/WFC images, we derive the color--magnitude diagram of the old, metal-rich open cluster NGC 6791 to nearly 29th magnitude in V, which is the neighborhood of the hydrog…
RR Lyrae variables in Galactic globular clusters V. The case of M3 pulsators
M. Castellani, V. Castellani, S. Cassisi
We use our synthetic Horizontal Branch (HB) procedure to approach the debated problem concerning the adequacy of canonical HB stellar models to account for the observed peaked dist…