This page contains lecture notes on the course MNFFY~X2/H98
"Stjerneatmosfaerer" (Stellar atmospheres) read in the fall
semester 1998 at the Physics Institute of NTNU, Trondheim.
The course followed the classical text-book by D. Mihalas: "Stellar
atmospheres", Freeman & co., San Francisco, 1978 (the first edition 1970).
In the present document are explicitelly written only comments and
additions to chapters (listed according to the 2nd editions)
included into the programm of the course.
Some more topics connected mainly
with the observational practice (spectroscopy and photometry)
and with the cases of extended atmospheres and atmospheres of
binaries are added by the lecturer.
The text has been revised and supplemented for the purpose of
course Stjernefysikk (Stellar physics)
read in the fall semester 2000.
The course could be
continued on a summer practice at Ondrejov observatory close to
Prague (at the 2-m spectroscopic telescope) and there are different
possibilities for master or PhD. thesis in both theoretical as
well as observational branch of the field.
To get more information contact, please, the author.
1. Introduction (29.11.00)
- basic stellar parameters (spectral
classification, HR-diagram) and optical observations
(photometry and spectroscopy)
2. Radiative transfer (29.11.00)
- theory of radiative transfer, its links
to kinetic theory, equation of radiative transfer in
plane-parallel and spherical approximation and in moving
media. Formal solution of radiative transfer.
Moments of radiation field. Problem of scattering.
Grey atmosphere. Milne - Eddington approximation.
Methods of numerical solutions,
Lambda-iteration, approximate Lambda-operators.
3. Formation of spectrum (29.11.00)
Einstein coefficients - absorption, emission and
scattering, source function.
Interaction of quantum systems with radiation field -
absorption in lines.
Thermodynamic equilibrium - temperature, local thermodynamic
equilibrium and non-LTE. Equation of statistical equilibrium.
4. Model atmospheres and their applications
Hydrostatic equilibrium and hydrodynamics - validity of
hydrostatic approximation, convection, meridional circulations
in non-symmetric stars, stellar winds, hydrostatic approximation
in accretion disks.
Stellar photometry - data reduction, light-curve models, eclipsing
binaries, limb-darkening, reflection effect.
Stellar spectroscopy - data reduction, comparison with model spectra,
spectra of binaries, disentangling.
Appendix - Generalised functions (29.11.00)
- convolution, Fourier transform
Readers may find interesting the textbook
Radiative transfer in stellar atmospheres
by R. J. Rutten
Astronomical Institute of the Academy of Sciences
of the Czech Republic,
251 65 Ondrejov,
tlf.: +420 204 620 141
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times since June 1, 1998