Falk Herwig

i process and CEMP-s+r stars

1 Department of Physics & Astronomy, University of Victoria, Victoria, BC, V8P5C2, Canada 2 Joint Institute for Nuclear Astrophysics, USA 3 NuGrid collaboration, http://www.nugridstars.org 4 Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland 5 Oak Ridge National Laboratory, P.O. Box 2008,Oak Ridge, TN 37831 6 LCSE & Department of Astronomy, University of Minnesota, Minneapolis, MN 55455, USA 7 Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA

The ESO Large Programme “First Stars”

In ESO period 65 (April-September 2000) the large programme 165.N-0276, led by Roger Cayrel, began making use of UVES at the Kueyen VLT telescope. Known within the Team and outside as ``First Stars, it was aimed at obtaining high resolution, high signal-to-noise ratio spectra in the range 320 nm -- 1000 nm for a large sample of extremely metal-poor (EMP) stars identified from the HK objective prism survey.In this contribution we highlight the main results of the large programme.

AGB star models. Results from 1D stellar evolution and multi-dimensional hydrodynamics simulations

In this review I am discussing the current state of simulating the internal evolution of AGB stars. Recent work on AGB stars include the effect of rotation, magnetic fields and internal gravity waves, as well as thermohaline mixing induced by the He + He pp-chain reaction. Hydrodynamic simulations of the interior convection of AGB stars are now becoming available, giving insights to convective boundary mixing, for example for He-shell flash convection. At very low metallicity convective-reactive events are encountered in AGB stars (as well as in massive stars), and the necessity of hydrodynamic simulations to address this difficult phase of stellar evolution is emphasized.