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Found 12 talks width keyword radiative transfer

Wednesday November 5, 2008

On the fate of the most massive stars

Armagh Observatory, Northern Ireland

Abstract

Radiation-driven mass loss largely determines the life expectancy of massive stars. I will present our most recent mass-loss predictions for massive stars, which are obtained from Monte-Carlo multi-line radiative transfer calculations. I will show how these predictions are expected to change as a function of metallicity (and redshift!) and confront the results against data from the VLT FLAMES large programme of massive stars. Finally, I discuss some of the more intricate aspects of the physics of radiation-driven outflows, emphasizing the relevance for the rotational evolution of massive stars into the Luminous Blue Variable phase. This is shown to lead to some rather unexpected results... in particular for the progenitors of supernovae and gamma-ray bursts -- calling for some major paradigm shifts of even our most basic framework of massive star evolution.

Archived in: Stars - Keywords:supernovae, stellar evolution, massive stars, gamma rays bursts, radiative transfer

Abstract

Tuesday April 29, 2008

Radiation-hydrodynamical model atmospheres across the Hertzsprung-Russell diagram

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

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