Found 132 talks archived in Stars

Thursday May 29, 2008

The binary population in Galactic globular clusters: theory versus observations

Dr. Antonio Sollima

Instituto de Astrofísica de Canarias, Spain

Abstract

I present the first results of a long term project devoted to the study of the evolution of the binary population in globular clusters. Using deep ACS@HST images of a sample of 13 globular clusters I estimated the fraction of binaries in the cores of these clusters. From a theoretical side, I developed a simplified analytical code which simulates the evolution of the properties of the binary population in a dynamically evolving globular cluster. The comparison between theory and observations allows to evaluate the efficiency of the various processes of binary formation and destruction in these stellar systems and their dependence on the main cluster structural and dynamical parameters.

Archived in: The Galaxy, Stars - Keywords:globular clusters, stellar dynamics

Abstract

Tuesday April 29, 2008

Radiation-hydrodynamical model atmospheres across the Hertzsprung-Russell diagram

Prof. Hans-G. Ludwig

Observatoire de Paris-Meudon, France

Abstract

In the EU funded Marie Curie Excellence Team CIFIST (Cosmological Impact of the FIrst STars) work is under way to construct 3D radiation-hydrodynamical model atmospheres for late-type dwarfs and giants, in particular of low metallicity. I will present an overview of the present state of the efforts, discuss some applications of the models, and point to necessary future developments.

Archived in: Stars, Particle astrophysics, physical data and processes - Keywords:late-type stars, radiative transfer, hydrodynamics

Abstract