Influence of Collisions with Hydrogen Atoms on Non-LTE Effects for K I and Ca II in Stellar Atmospheres

• Published in: Astronomy letters Vol. 46; no. 9; pp. 621 - 629
• Main Authors: Neretina, M. D., Mashonkina, L. I., Sitnova, T. M., Yakovleva, S. A., Belyaev, A. K.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2020; Springer Nature B.V
• Subjects: Abundance; Astronomy; Astrophysics and Astroparticles; Atmosphere; Collision rates; Dwarf stars; Fine structure; Hydrogen; Hydrogen atoms; Line spectra; Local thermodynamic equilibrium; Metallicity; Observations and Techniques; Physics; Physics and Astronomy; Rate constants; Stellar atmospheres; calcium abundance in stars; spectral line formation in non-LTE conditions; stellar atmospheres; potassium abundance in stars

We have constructed a new K I model atom using currently available atomic data. We have performed calculations for K I by abandoning the assumption of local thermodynamic equilibrium (non-LTE) for the Sun and three moderately metal-poor dwarf stars. To take into account the inelastic processes in co...