Oscar Straniero - Academia.edu (original) (raw)

Uploads

Papers by Oscar Straniero

Contents: Turn off luminosity and age; cooling of white dwarfs.

The d He,p He cross section has been measured at Es 4.2 to 13.8 keV using the LUNA underground ac... more The d He,p He cross section has been measured at Es 4.2 to 13.8 keV using the LUNA underground accelerator facility. The experiment was performed to determine the magnitude of the atomic screening effect and to establish values for the energy loss used in data reduction. The observed stopping power of the 3He ions in the D target is in

Proceedings of the International Astronomical Union, 2005

The Astrophysical Journal, 1993

Astrophysics and Space Science Library, 2002

The presupernova evolutions and the explosive yields of massive stars in the range 13-80 Msolar w... more The presupernova evolutions and the explosive yields of massive stars in the range 13-80 Msolar with metallicity Z=0 and Z=10-3 are presented. Differences in the final elemental yields between the two sets of models are addressed and discussed in terms of differences in the presupernova evolutionary properties. Implications on the enrichment of the interstellar medium for the various generations of

The presolar origin of the peculiar meteoritic noble gas components: Ne-E(H), Ar- s, Kr-s, and Xe... more The presolar origin of the peculiar meteoritic noble gas components: Ne-E(H), Ar- s, Kr-s, and Xe-s is revisited. These components are carried by carbonaceous grains directly condensing in the extendend envelopes of C-rich Asymptotic Giant Branch (AGB) stars. These stars are surrounded by dusty circumstellar envelopes and suffer strong mass loss by stellar winds. The processes of nucleosynthesis in the

Journal of Physics: Conference Series, 2006

In stars, four hydrogen nuclei are converted into a helium nucleus by two competing nuclear fusio... more In stars, four hydrogen nuclei are converted into a helium nucleus by two competing nuclear fusion processes: the proton - proton chain (p-p) and the carbon - nitrogen - oxygen (CNO) cycle. At temperatures higher than 2 · 107 K, the CNO cycle dominates the energy production. In particular, its rate is determined by the slowest reaction: 14N(p, gamma)15O. Direct

Proceedings of the International Astronomical Union, 2011

We present predictions of neutron-capture elements produced from AGB stars at various metalliciti... more We present predictions of neutron-capture elements produced from AGB stars at various metallicities. We concentrate on s-process in low-metallicity stars. We show that the usual r and s process separation using the classsical analysis of the s-process fails at low metallicicty where the s-flow preferentially feeds Lead. We compare our prediction with a number of 'lead stars' recently observed..

ABSTRACT We show that, by assuming the rotating Double Degenerate scenario for the SNe Ia progeni... more ABSTRACT We show that, by assuming the rotating Double Degenerate scenario for the SNe Ia progenitors, the total mass of the progenitor systems is the leading parameter determining the observational properties of these events. Moreover, basing on population synthesis models, we show that the distribution of DD systems good candidate as SNe Ia progenitors in late and early type galaxies well explains the evidence that high luminosity events occurs only in star forming galaxies.