Improvements to the Single-Valued Parameter (SVP) Method for Radiative Acceleration Calculations: Preliminary Results

F. LeBlanc, G. Alecian

Detailed calculations of radiative accelerations can be numerically onerous especially in stellar evolution modelling. Parametric equations for radiative accelerations that separate the terms depending explicitly on the atomic data from those depending on the physical properties of the stellar plasma have been developed in the past decades (and particularly since 2004). The parameters are calculated in advance and radiative acceleration calculations may then be carried out relatively quickly during stellar evolution simulations without the need for detailed atomic data. Several improvements regarding, for instance, the values of the parameters or the fitting procedure to more precisely calculate radiative accelerations are being developed. These parameters are generally tabulated using The Opacity Project atomic data and radiative accelerations. Results for certain elements of interest are shown in a typical A-type star.

Proceedings of the Polish Astronomical Society, vol. 11, 194-200 (2020)

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