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Journal Articles Proceedings of the conference Stars and their Variability Observed from Space Year : 1970

Recent advances in numerical models that include atomic diffusion in stars

G. Alecian

Abstract

Atomic diffusion in stars is efficient in changing the distribution of elements slowly but strongly in any radiative zone. The process may produce detectable effects, over time-scales stretching from a few decades to star's lifetime, according to the depth of the radiative zones. The main consequences are that superficial abundances may depart from standard values, but also that internal structure and seismic diagnostics are affected owing to changes in local opacities. The main difficulty of including atomic diffusion in numerical models comes from radiation force (the dominant force acting on atoms within the layers concerned), which is specific to chemical species through their atomic properties, and which makes the process of abundance stratification strongly non-linear in usual situations (especially in atmospheres). This talk presented recent improvements that involve a fast method for calculating radiative accelerations in stellar interiors, and described progress in the modelling of stellar atmospheres.
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obspm-04059522 , version 1 (05-04-2023)

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G. Alecian. Recent advances in numerical models that include atomic diffusion in stars. Proceedings of the conference Stars and their Variability Observed from Space, 1970, pp.367 - 370. ⟨obspm-04059522⟩
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