New generation model atmospheres for chemically peculiar stars

TL;DR

This paper introduces a new grid of advanced model atmospheres for chemically peculiar stars, accounting for their unique chemical compositions and magnetic fields, to improve stellar parameter and abundance determinations.

Contribution

The study develops a comprehensive grid of next-generation model atmospheres for magnetic chemically peculiar stars using the LLmodels code, considering their distinctive chemical and magnetic properties.

Findings

First results of the new model atmosphere calculations are presented.

The models account for chemical inhomogeneities and magnetic effects.

The grid covers the parameter space of SrCrEu and Si-peculiar stars.

Abstract

The atmospheric structure of chemically peculiar stars deviates from that of normal stars with similar fundamental parameters due to unusual chemistry, abundance inhomogeneities and the presence of strong magnetic field. These effects are not considered in the standard model atmospheres, possibly leading to large errors in the stellar parameter determination and abundance analysis. To tackle this problem we used the state-of-the-art opacity sampling model atmosphere code LLmodels to calculate comprehensive grid of new generation model atmospheres for magnetic CP stars. This grid covers the whole parameter space occupied by SrCrEu and Si-peculiar stars, taking into account characteristic temperature dependence of the chemical abundances. Here we present the first results of our model atmosphere calculations.