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Evolution of the first stellar generations
R. Hirschi, A. Maeder, G. Meynet +2
Although the theoretical study of very low metallicity (Z) and metal-free stars is not new, their importance has recently greatly increased since two related fields have been devel…
Pre-supernova models at very low metallicity
R. Hirschi
A series of fast rotating models at very low metallicity (Z=1e-8) was computed in order to explain the surface abundances observed at the surface of CEMP stars, in particular for n…
GRB progenitors at low metallicities
R. Hirschi, G. Meynet, A. Maeder
We calculated pre-supernova evolution models of single rotating massive stars. These models reproduce observations during the early stages of the evolution very well, in particular…
The impact of stellar rotation on the CNO abundance patterns in the Milky Way at low metallicities
C. Chiappini, R. Hirschi, F. Matteucci +3
We investigate the effect of new stellar models, which take rotation into account, computed for very low metallicities on the chemical evolution of the earliest phases of the Milky…
Very low metallicity massive star models: Pre-SN evolution and primary nitrogen production
Raphael Hirschi
Two series of models were computed. The first series consists of 20 solar mass models with varying initial metallicity (Z=0.02 down to Z=10^{-8}) and rotation (V_{ini}=0-600 km/s).…
The evolution of massive stars in the context of V838 Monocerotis
Raphael Hirschi
The aim of this paper is to look at the evolution of massive stars in order to determine whether or not the progenitor of V838 Mon may be a massive star. In the first part of this…