Absorption and Emission of Radiation 5. Quantum Mechanical Analysis 6. Looking for beautiful books? Classical Analysis 6. Unsourced material may be challenged and removed.
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Spectral and luminosity classification. Relation of theory and observation. Elements of Radiative Transfer Theory: Definitions. Emission, absorption, and scattering. Equation of transfer, radiative equilibrium. Two-stream and Eddington approximations. Emergent flux and limb darkening. Perfect gases and the Saha equation. Conditions for LTE. Depression of the adiabatic gradient in a partial ionization zone. Radiative and collisional rates; departure coefficients. Calculation of Einstein coefficients and collision cross-sections.
Continuum Opacity: Opacity sources in high-, intermediate-, and low-temperature stellar atmospheres. Temperature-correction procedures. Results and Comparison With Observations: Absolute energy distributions. The Balmer jump. Sample model atmosphere calculation. Flux distributions for sample model stars. Effect of absorption edges on atmospheric structure, line-blanketing, molecule formation.
Mixing Length Theory: Convection and partial ionization zones. Simple phenomenological models. Line Spectra: Line absorption profiles.
Natural broadening and the Lorentz profile. Doppler broadening and the Voigt profile. Collisional broadening. Stark broadening, Inglis Teller formula. Line Transfer Problem. Center-to-limb variations. Schuster mechanisms. Curve of growth and abundance determinations. Model atmosphere line calculations. Line blanketing theory, LTE line formation. Development of a first-principles approach to the problem. Applications to Hot stars.
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