Near-surface stellar magneto-convection: simulations for the Sun and a metal-poor solar analog

TL;DR

This paper uses 2D simulations to explore how metallicity affects near-surface magneto-convection in the Sun and a metal-poor solar analog, revealing stronger horizontal magnetic fields in metal-poor atmospheres.

Contribution

It introduces magneto-hydrodynamical models for metal-poor stellar atmospheres, highlighting the impact of metallicity on magnetic field properties.

Findings

Horizontal magnetic fields are stronger in optically thin layers of metal-poor atmospheres.

Simulations provide new insights into the influence of metallicity on stellar magneto-convection.

Models can be used to study magnetic effects in different stellar compositions.

Abstract

We present 2D local box simulations of near-surface radiative magneto-convection with prescribed magnetic flux, carried out with the MHD version of the CO5BOLD code for the Sun and a solar-like star with a metal-poor chemical composition (metal abundances reduced by a factor 100, [M/H]=-2). The resulting magneto-hydrodynamical models can be used to study the influence of the metallicity on the properties of magnetized stellar atmospheres. A preliminary analysis indicates that the horizontal magnetic field component tends to be significantly stronger in the optically thin layers of metal-poor stellar atmospheres.