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The first stars: CEMP--no stars and signatures of spinstars
Andre Maeder, Georges Meynet, Cristina Chiappini
(Abridged) The CEMP--no stars are "carbon-enhanced-metal-poor" stars that in principle show no evidence of s-- and r--elements from neutron captures. We try to understand the origi…
The impact of mass-loss on the evolution and pre-supernova properties of red supergiants
G. Meynet, V. Chomienne, S. Ekström +7
The post main-sequence evolution of massive stars is very sensitive to many parameters of the stellar models. Key parameters are the mixing processes, the metallicity, the mass-los…
Physics of rotation: problems and challenges
Andre Maeder, Georges Meynet
We examine some debated points in current discussions about rotating stars: the shape, the gravity darkening, the critical velocities, the mass loss rates, the hydrodynamical insta…
Magnetic braking of stellar cores in red giants and supergiants
Andre Maeder, Georges Meynet
Magnetic configurations, stable on the long term, appear to exist in various evolutionary phases, from Main-Sequence stars to white dwarfs and neutron stars. The large scale ordere…
Populations of rotating stars III. SYCLIST, the new Geneva Population Synthesis code
Cyril Georgy, Anahi Granada, Sylvia Ekström +5
(abridged) We present a new tool for building synthetic colour-magnitude diagrams of coeval stellar populations. We study, from a theoretical point of view, the impact of axial rot…
Evolution of surface CNO abundances in massive stars
André Maeder, Norbert Przybilla, Maria Fernanda Nieva +4
The nitrogen to carbon (N/C) and nitrogen to oxygen (N/O) ratios are the most sensitive quantities to mixing in stellar interiors of intermediate and massive stars. We further inve…