TL;DR
This paper summarizes the fundamental assumptions of NLTE physics in stellar atmospheres, compares LTE and NLTE, and discusses equations and methods for solving kinetic equilibrium.
Contribution
It provides a clear overview of NLTE assumptions, highlights LTE limitations, and discusses solution methods for kinetic equilibrium equations in stellar atmospheres.
Findings
LTE is a poor approximation when radiative transitions dominate
Comparison of thermodynamic equilibrium, LTE, and NLTE assumptions
Discussion of equations and methods for kinetic equilibrium
Abstract
Basic assumptions of the NLTE approximation in stellar atmospheres are summarized. The assumptions of thermodynamic equilibrium, local thermodynamic equilibrium (LTE), and non-LTE (NLTE) are compared. It is emphasized that LTE is a poor approximation if radiative transitions dominate in stellar atmospheres. The equations of kinetic equilibrium and methods of their solution are discussed.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Advanced Thermodynamics and Statistical Mechanics · Astrophysics and Star Formation Studies