108 citations · 810 across the 21 of their papers we have counts for
13 papers · 1 filter
Bright metal-poor variables: why "Anomalous" Cepheids?
F. Caputo, V. Castellani, S. Degl'Innocenti +2
We investigate the theoretical scenario concerning the large sample of variables recently discovered in the dwarf, metal-poor irregular galaxy Leo A, focusing the attention on the…
Asymptotic Giant Branch predictions: theoretical uncertainties
S. Cassisi, V. Castellani, S. Degl'Innocenti +2
In this paper we investigate the level of agreement between observations and "new" Asymptotic Giant Branch (AGB) models, as produced by updating the physical inputs adopted in prev…
Stellar models and Hyades: the Hipparcos test
V. Castellani, S. Degl'Innocenti, P. G. Prada Moroni
We compare theoretical stellar models for Main Sequence (MS) stars with the Hipparcos database for the Hyades cluster to give a warning against the uncritical use of available theo…
Theoretical stellar models for old galactic clusters
V. Castellani, S. Degl'Innocenti, M. Marconi
We present new evolutionary stellar models suitable for old Population I clusters, discussing both the consequences of the most recent improvements in the input physics and the eff…
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…
Stars as galactic neutrino sources
E. Brocato, V. Castellani, S. Degl'Innocenti +2
Theoretical expectations concerning stars as neutrino sources are presented according to detailed evaluations of the stellar evolutionary histories for an extended grid of stellar…
Helioseismology and p+p d + e + in the sun
S. Degl'Innocenti, G. Fiorentini, B. Ricci
By using a phenomenological field theory of nucleon-nucleon interactions, Oberhummer et al. found a cross section of p+p d + e + about 2.9 times that given by the p…
Helioseismology and standard solar models
S. Degl'Innocenti, W. A. Dziembowski, G. Fiorentini +1
We present a systematical analysis of uncertainties in the helioseismological determination of quantities characterizing the solar structure. We discuss the effect of errors on the…
The age of the oldest globular clusters
M. Salaris, S. Degl'Innocenti, A. Weiss
The age of three of the oldest clusters -- M15, M68, M92 -- has been redetermined. We use the latest EOS and opacity data available for calculating both isochrones and zero age hor…
Time-Variation of Newton's Constant and the Age of Globular Clusters
S. Degl'Innocenti, G. Fiorentini, G. G. Raffelt +2
A variation of Newton's constant over cosmological time scales would modify the main-squence time of globular cluster (GC) stars. We have calculated the evolution of low-mass s…
The Hot End of Evolutionary Horizontal Branches
V. Castellani, S. Degl'Innocenti, L. Pulone
In this paper we investigate the hot end of the HB, presenting evolutionary constraints concerning the CM diagram location and the gravity of hot HB stars. According to the adopted…
HB Morphology and Age Indicators for Metal-Poor Stellar Systems with Age in the Range of 1 to 20 Gyr
F. Caputo, S. Degl'Innocent
Isochrone computations and horizontal branch (HB) models for Y(MS)=0.23 and two values of Z (0.0001, 0.0004)are used to derive constraints on the age indicators and HB morphology o…
Dwarf Spheroidals and the Evolution of Not-Too-Old Population II Stars
V. Castellani, S. Degl'Innocenti
Previous evolutionary computations concerning stars with masses in the range of the ``Red Giants Transition Phase'' are extended to lower metallicities. Clusters isochrones for two…