Spectrum synthesis for magnetic, chemically stratified stellar atmospheres

TL;DR

This paper introduces new spectrum synthesis codes, Synth3 and Synthmag, designed to model the complex atmospheres of magnetic chemically peculiar stars, accounting for magnetic fields, chemical stratification, and anomalous compositions.

Contribution

The paper presents detailed descriptions of the synthesis codes Synth3 and Synthmag, which improve modeling of magnetic chemically peculiar star atmospheres by including multiple complex effects.

Findings

Codes are reliable for line identification.

Effective in magnetic field determination.

Useful for chemical abundance and stratification analysis.

Abstract

Modern investigations of magnetic chemically peculiar stars reveal a variety of complex processes in their atmospheres. Realistic spectrum synthesis modelling of these objects has to take into account anomalous chemical composition, strong magnetic field and chemical stratification. These effects complicate calculation of theoretical spectra, especially when one has to deal with large number of lines and wide spectral regions. To overcome the formidable problem of comparing model and observed spectra for magnetic chemically peculiar stars, a new suite of spectrum synthesis programs was developed. Here we describe in detail the synthesis codes, Synth3 and Synthmag and present examples of their application to various aspects of the peculiar-star surface phenomena. The new codes proved to be reliable tools for the line identification, magnetic field determination, chemical abundance and stratification analysis.