Modelling stellar convection and pulsation in multidimensions using the ANTARES code

TL;DR

This paper describes the development and application of the ANTARES simulation code to model the complex interaction of pulsation and convection in classical pulsating stars, with a focus on Cepheid variables.

Contribution

It introduces new extensions to the ANTARES code, including a spherical grid, grid refinement, and radiative transfer considerations, enabling detailed multidimensional stellar pulsation modeling.

Findings

Analysis of convection zones in Cepheid stars.

Observation of pulsation-convection interaction effects.

Insights into atmospheric structure variations.

Abstract

The ANTARES code has been designed for simulation of astrophysical flows in a variety of situations, in particular in the context of stellar physics. Here, we describe extensions as necessary to model the interaction of pulsation and convection in classical pulsating stars. These extensions encomprise the introduction of a spherical grid, movable in the radial direction, specific forms of grid-refinement and considerations regarding radiative transfer. We then present the basic parameters of the cepheid we study more closely. For that star we provide a short discussion of patterns of the H+HeI and the HeII convection zones and the interaction with pulsation seen in the pdV work or atmospheric structures.