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2 - Fundamental Physical Aspects of Radiative Transfer

Published online by Cambridge University Press:  24 December 2019

Edited by
Lucio Crivellari ,
Sergio Simón-Díaz  and
María Jesús Arévalo
Lucio Crivellari
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
Sergio Simón-Díaz
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
María Jesús Arévalo
Affiliation:
Universidad de la Laguna, Tenerife
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Summary

We consider the fundamental physical processes in stellar atmospheres, together with the basic equations, approximations and techniques used to model them.The coupling of the RT equations with the statistical equilibrium equations is discussed, as well as the role of the atomic properties. The structure equations (equation of state, momentum and energy conservation) that complete the set of equations required to compute a model atmosphere are examined, as well as the broadening mechanisms that change the appearance of the spectral line.

Keywords

Stellar atmospheres: theory –Radiative transfer –Absorption and emission coefficients –Statistical equilibrium equations –Line broadening
Type
Chapter
Information
Radiative Transfer in Stellar and Planetary Atmospheres , pp. 33 - 80
Publisher: Cambridge University Press
Print publication year: 2020

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