A non-LTE study of neutral and singly-ionized iron line spectra in 1D models of the Sun and selected late-type stars

Abstract

Aims. We evaluate non-local thermodynamical equilibrium (non-LTE) line formation for the two ions of iron and check the ionization equilibrium between Fe i and Fe ii in model atmospheres of the cool reference stars based on the best available complete model atom for neutral and singly-ionized iron.