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First full evolutionary computation of the He-flash induced mixing in Population II stars
S. Cassisi, H. Schlattl, M. Salaris +1
The core helium-flash in low-mass stars with extreme mass loss occurs after the tip of the RGB, when the H-rich envelope is very thin. The low efficiency of the H-shell source enab…
Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
M. Zoccali, A. Renzini, S. Ortolani +7
We present a new determination of the metallicity distribution, age, and luminosity function of the Galactic bulge stellar population. By combining near-IR data from the 2MASS surv…
Some clues on the tilt of the Horizontal Branches in metal-rich clusters
G. Raimondo, V. Castellani, S. Cassisi +2
We discuss some clues on the large tilt observed in the Horizontal Branch of the metal-rich galactic globular clusters NGC 6388 and NGC 6441. This not yet understood feature is inv…
A New Feature Along the Extended Blue Horizontal Branch of NGC 6752
Y. Momany, G. Piotto, A. Recio-Blanco +3
In this letter we report on the detection of a new feature in the complex structure of the horizontal branch (HB) of the Galactic globular cluster NGC 6752. In the U vs. (U-V) plan…
Hot Horizontal Branch Stars: Predictions for Mass Loss
Jorick S. Vink, Santi Cassisi
We predict mass-loss rates for the late evolutionary phases of low-mass stars, with special emphasis on the consequences for the morphology of the Horizontal Branch (HB). We show t…
On the reliability of the semiempirical RR Lyrae Period - Blue Amplitude - V-band Luminosity relation
R. De Santis, S. Cassisi
We investigate the accuracy and reliability of the semiempirical period - blue amplitude - V-band luminosity relationship for ab-type RR Lyrae stars originally obtained by Castella…
The surface carbon and nitrogen abundances in models of ultra metal-poor stars
H. Schlattl, M. Salaris, S. Cassisi +1
We investigate whether the observed high number of carbon- and nitrogen-enhanced extremely metal-poor stars could be explained by peculiar evolutionary properties during the core H…
Global metallicity of globular cluster stars from colour-magnitude diagrams
F. Caputo, S. Cassisi
We have developed an homogeneous evolutionary scenario for H- and He-burning low-mass stars by computing updated stellar models for a wide metallicity and age range (0.0002$\le Z \…
Red Giant Branch stars: the theoretical framework
M. Salaris, S. Cassisi, A. Weiss
Theoretical predictions of Red Giant Branch stars' effective temperatures, colors, luminosities and surface chemical abundances are a necessary tool for the astrophysical interpret…
On the observational properties of He-burning stars: some clues on the tilt of the HB in metal rich clusters
G. Raimondo, V. Castellani, S. Cassisi +2
We investigate the predicted Color-Magnitude distribution of metal-rich Horizontal Branch (HB) stars, discussing selected theoretical models computed under various assumptions abou…