Speaker
Dr
Morgan Deal
(Observatoire de Paris)
Description
Atomic diffusion, including the effect of radiative accelerations on individual elements, leads to important variations of the chemical composition inside the stars. The accumulation in specific layers of the elements, which are the main contributors of the local opacity, leads to hydrodynamical instabilities that modify the internal stellar structure and surface abundances. In this talk we show that the modification of the initial chemical composition by atomic diffusion has important effects on the internal stellar mixing and leads to different surface abundances of the elements. This leads locally to an increse of the Rosseland opacity by a factor three in some cases. These processes could no longer be neglected in stellar evolution models as the observations are more and more precise. Especialy with the future space missions as Tess and Plato.
Primary author
Dr
Morgan Deal
(Observatoire de Paris)
Co-authors
Dr
Olivier Richard
(LUPM)
Prof.
Sylvie Vauclair
(IRAP)
