1–4 Aug 2017
Western Michigan University Kalamazoo, MI, USA
US/Eastern timezone

Hydrodynamical instabilities induced by atomic diffusion in F and A stars

2 Aug 2017, 09:40
20m
Fetzer Center, Putney Auditorium (Western Michigan University Kalamazoo, MI, USA)

Fetzer Center, Putney Auditorium

Western Michigan University Kalamazoo, MI, USA

2350 Business Court, Kalamazoo, MI 49008, USA
Contributed talks Atomic Opacities

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

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