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The "Tip" of the Red Giant Branch as a distance indicator: theoretical calibration and the value of H_0
S. Cassisi, M. Salaris
Updated theoretical relations for the run of the bolometric and I magnitude of the Tip of the Red Giant Branch (TRGB) with respect to the metallicity are provided. An analogous rel…
Stellar models for very low mass main sequence stars: the role of model atmospheres
E. Brocato, S. Cassisi, V. Castellani
We present Very Low Mass stellar models as computed including non-grey model atmospheres for selected assumptions about the star metallicities. The role of atmospheres is discussed…
Un updated theoretical scenario for globular cluster stars
S. Cassisi, V. Castellani, S. Degl'Innocenti +1
In the first part of this paper we revisit the history of theoretical predictions for HB luminosities in old Population II stellar clusters, starting from the results of `old' evol…
The effect of diffusion on the Red Giant luminosity function 'bump'
S. Cassisi, S. Degl'Innocenti, M. Salaris
This paper investigates the effect of microscopic diffusion of helium and heavy elements on the location of the Red Giant Branch Luminosity Function Bump in Population II stellar m…
The "Tip" of the Red Giant Branch as a distance indicator: results from evolutionary models
M. Salaris, S. Cassisi
New theoretical evaluations of the Red Giant Branch Tip (TRGB) luminosity, by adopting the most updated physical inputs in computing canonical stellar models, are presented. Theore…
Metal Rich RR Lyrae Variables: II. The Pulsational Scenario
Giuseppe Bono, Filippina Caputo, Santi Cassisi +2
We present a theoretical investigation on the pulsational behavior of metal-rich RR Lyrae variables over the range of evolutionary parameters suitable for stars with metallicities…