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- W2904882007 abstract "Stellar models with homogeneous abundances fail to reproduce the pulsation frequencies of early B-type stars. Their oscillations are excited by kappa-mechanism involving the Fe-peak elements where they are main contributors to the opacity (the Z-bump) and a ad hoc increase of the opacity in these layers is necessary to match the observations. We test whether atomic diffusion can induce such an opacity increase through Fe and Ni accumulations in the Z-bump. With models computed using the Toulouse-Geneva Evolution Code, we show that atomic diffusion changes the abundance profiles inside the star, leading to an overabundance of the iron-peak elements in the upper envelope. The opacity may reach the amount required by seismic studies, provided that fingering mixing, which extends the size of the overabundance zone, is taken into account. Mass-loss is also required to evolve the model until the end of the main sequence." @default.
- W2904882007 created "2018-12-22" @default.
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- W2904882007 date "2018-12-20" @default.
- W2904882007 modified "2023-09-27" @default.
- W2904882007 title "Effect of diffusion-induced element accumulation on the opacity inside B stars" @default.
- W2904882007 hasPublicationYear "2018" @default.
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