Influence of inelastic collisions with hydrogen atoms on the non-local thermodynamic equilibrium line formation for Fe I and Fe II in the 1D model atmospheres of late-type stars

• Published in: Astronomy and astrophysics (Berlin) Vol. 631; p. A43
• Main Authors: Mashonkina, L., Sitnova, T., Yakovleva, S. A., Belyaev, A. K.
• Format: Journal Article
• Language: English
• Published: Heidelberg EDP Sciences 01.11.2019
• Subjects: Abundance; atomic processes; Dwarf galaxies; Galactic halos; Hydrogen atoms; Inelastic collisions; Ionization; Iron; line: formation; Local thermodynamic equilibrium; One dimensional models; Red giant stars; Stars & galaxies; stars: abundances; stars: atmospheres; stars: late-type

Context. Iron plays a crucial role in studies of late-type stars. In their atmospheres, neutral iron is the minority species, and lines of Fe I are subject to the departures from local thermodynamic equilibrium (LTE). In contrast, one believes that LTE is a realistic approximation for Fe II lines. T...