How to compute pulsation frequencies of rotating stars: a look at the pulsation code StORM
Vincent Vanlaer (KU Leuven, Belgium)
Stellar models and asteroseismic observations of rotating stars are becoming more and more precise. However, computing pulsation frequencies of rotating stars is not a trivial effort. While some types of pulsators can be modelled with first-order approaches (the commonly used Ledoux splittings), this is not the case for many others, requiring higher-order approaches. For massive main-sequence pulsators (i.e. β Cep pulsators), the main contributing factor is the deformation of the stellar surface away from a perfect sphere. This introduces shifts in the overal pulsation frequencies, and introduces asymmetries in rotationally split multiplets, which one needs to take into account when modelling these pulsation frequencies.
In this presentation, I will discuss how the recently released oscillation code StORM (https://stellar-oscillations.org) makes it possible to include these rotational effects. I will also touch upon some of the other aspects of StORM that might make you want to use it (it’s fast!), and discuss some ongoing applications.