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A pulsational approach to the luminosity of Horizontal Branch stellar structures
R. De Santis, S. Cassisi
We discuss an alternative approach to constrain the absolute bolometric luminosity of Zero Age Horizontal Branch structures by using the observational pulsational properties of ab…
Stellar populations in the dwarf spheroidal galaxy Leo I
F. Caputo, S. Cassisi, M. Castellani +2
We present a detailed study of the color magnitude diagram (CMD) of the dwarf spheroidal galaxy Leo I, based on archival Hubble Space Telescope data. Our photometric analysis, conf…
Galactic Globular Cluster Stars: from Theory to Observation
S. Cassisi, V. Castellani, S. Degl'Innocenti +2
We use evolutionary calculations presented in a recent paper (Cassisi et al. 1998) to predict B,V,I magnitudes for stars in galactic globulars. The effect of the adopted mixing len…
On the Blue Tail of Horizontal Branch Stars
G. Bono, S. Cassisi
We discuss theoretical predictions for ZAHB models constructed either by including or neglecting the He extra-mixing effect recently suggested by Sweigart (1997). The comparison in…
A new analysis of the Red Giant Branch "Tip" distance scale and the value of the Hubble constant
M. Salaris, S. Cassisi
The theoretical evaluations of the Red Giant Branch Tip (TRGB) luminosity presented in Salaris & Cassisi (1997) are extended to higher metallicities, and compared with analogous in…