Astronomy 631: Radiative Transfer and Stellar Atmospheres
- Radiation field: definitons, energy
density, radiation pressure.
- Equation of transfer: interaction of
radiation and matter, transfer equation, angular
moments, radiative equilibrium, diffusion
approximation
- Grey atmosphere problem, definition, mean
opacities. approximate solutions,
- LTE equation of state
- Absorption cross section: Einstein
coefficients, continuous absorption and scattering
processes
- Solution of the transfer equation:
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- LTE model atmosphere: assumptions,
boundary value problem
- Statistical equilibrium: requirements for
LTE, non-LTE rate equations
- Non-LTE model atmosphere for early-type
stars
- Line formation:observable quantities,
line profiles, Voigt function
- Classical treatment of line formation:
Milne-Eddington model, curve of growth, LTE
spectrum synthesis
- Non-LTE line formation: two level atom
with and without continuum, multilevel atoms.
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This outline is representative only, and is likely to
change from instructor to instructor and from year to
year.
Recent instructors
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