Non-LTE line formation for Si I-II-III in A-B stars and the origin of Si II emission lines in iota Her

• Published in: arXiv.org
• Main Author: Mashonkina, Lyudmila
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 03.03.2020
• Subjects: B stars; Emission; Ionization; Local thermodynamic equilibrium; Physics - Solar and Stellar Astrophysics

A comprehensive model atom was developed for Si I-II-III using the most up-to-date atomic data available so far. Based on the non-local thermodynamic equilibrium (non-LTE = NLTE) line formation for Si I, Si II, and Si III and high-resolution observed spectra, we determined the NLTE abundances for a...