Opacity calculations for stellar astrophysics

Abstract

Opacity is a key ingredient of stellar structure and evolution. In the present work, we recall the role of opacity in asteroseismology, focusing mainly on two kinds of astrophysical objects: $\beta$ Cephei-type stars, and the Sun. The detailed opacity code SCO-RCG for local-thermodynamic-equilibrium plasmas is described and interpretation of laser and Z-pinch experiments are presented and discussed. The possible role of multi-photon processes on radiative accelerations is outlined, and the main aspects of opacity modeling which should be improved are mentioned.

Proceedings of the PHOST "Physics of Oscillating Stars" conference, 2-7 Sept. 2018, Banyuls-sur-mer (France). arXiv admin note: text overlap with arXiv:1802.00782