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Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
Luigi R. Bedin, Santi Cassisi, Fiorella Castelli +6
We propose a zero-point photometric calibration of the data from the ACS/WFC on board the Hubble Space Telescope, based on a spectrum of Vega and the most up to date in-flight tran…
Metallicities on the Double Main Sequence of omega Centauri Imply Large Helium Enhancement
Giampaolo Piotto, Sandro Villanova, Luigi R. Bedin +10
Having shown in a recent paper that the main sequence of omega Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is…
Classical Cepheid Pulsation Models. X. The Period-Age Relation
G. Bono, M. Marconi, S. Cassisi +3
We present new Period-Age (PA) and Period-Age-Color (PAC) relations for fundamental and first overtone classical Cepheids. Current predictions rely on homogeneous sets of evolution…
A Homogenous Set of Globular Cluster Relative Distances and Reddenings
A. Recio-Blanco, G. Piotto, F. De Angeli +6
We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. (2002), calibrated to the HST…
Color transformations and bolometric corrections for Galactic halo stars: alpha-enhanced vs scaled-solar results
Santi Cassisi, Maurizio Salaris, Fiorella Castelli +1
We have performed the first extensive analysis of the impact of an [alpha/Fe]>0 metal distribution on broadband colors in the parameter space (surface gravity, effective temperatur…
RR Lyrae variables in Galactic globular clusters: IV. Synthetic HB and RR Lyrae predictions
S. Cassisi, M. Castellani, F. Caputo +1
We present theoretical predictions concerning horizontal branch stars in globular clusters, including RR Lyrae variables, as derived from synthetic procedures collating evolutionar…
The double main sequence of Omega Centauri
L. R. Bedin, G. Piotto, J. Anderson +4
Recent, high precision photometry of Omega Centauri, the biggest Galactic globular cluster, has been obtained with Hubble Space Telescope. The color magnitude diagram reveals an un…
A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
A. Pietrinferni, S. Cassisi, M. Salaris +1
We present a large and updated stellar evolution database for low-, intermediate- and high-mass stars in a wide metallicity range, suitable for studying Galactic and extragalactic…
Omega Centauri: The Population Puzzle Goes Deeper
L. R. Bedin, G. Piotto, J. Anderson +5
We present HST observations that show a bifurcation of colors in the middle main sequence of the globular cluster Omega Centauri. We see this in three different fields, observed wi…
The ubiquitous nature of the Horizontal Branch second U-jump: A link with the Blue Hook scenario?
Y. Momany, L. R. Bedin, S. Cassisi +5
In a previous paper we reported on a discontinuity in the extreme horizontal branch (EHB) of the Galactic globular cluster NGC6752, which we called the second U-jump. This feature…
Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms
Giampaolo Piotto, Francesca De Angeli, Ivan R. King +7
We discuss the main properties of the Galactic globular cluster (GC) blue straggler stars (BSS), as inferred from our new catalog containing nearly 3000 BSS. The catalog has been e…