NLTE effects on Fe I/II in the atmospheres of FGK stars and application to abundance analysis of their spectra

TL;DR

This paper presents initial results on NLTE abundance corrections for Fe I lines in FGK star atmospheres, highlighting their impact on stellar parameter determinations.

Contribution

It provides the first large-scale calculations of NLTE corrections for Fe I/II, aiding more accurate stellar abundance analyses.

Findings

NLTE effects significantly influence Fe I line analysis.

Corrections affect derived stellar parameters.

Results improve the accuracy of stellar metallicity estimates.

Abstract

We describe the first results from our project aimed at large-scale calculations of NLTE abundance corrections for important astrophysical atoms and ions. In this paper, the focus is on Fe which is a proxy of stellar metallicity and is commonly used to derive effective temperature and gravity. We present a small grid of NLTE abundance corrections for Fe I lines and discuss how NLTE effects influence determination of effective temperature, surface gravity, and metallicity for late-type stars.