Basics of the NLTE physics
classification
🌌 astro-ph.SR
physics.atom-ph
keywords
equilibriumnlteapproximationassumptionsatmospheresstellarthermodynamicbasic
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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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