ASTR 545
Stellar Spectroscopy
T-Th 11:45-1:00
Astronomy Bldg, Rm 119
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Last Modified 09.05.06
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Assignment |
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Introduction
What generates the spectrum of a star? What is a stellar atmopshere?
Stellar spectra zoo, features, the big three (gravity, temperature, and abundance)
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Homework 1
Classifying
Stellar Spectra
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Atmosphere Physics
Gas Physics, velocities, densities
Local thermoequilibrium (LTE), Boltzmann equation
Excitation potentials, statistical weights, partition functions
Saha equation
Detailed balancing, charge and particle conservation
The radiation field, moments of the radiation field
The Transfer equation and radiative equilibrium
The Grey atmosphere, mean opacities
Model atmospheres
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Homework 2 [example F77 program ]
Homework 3
[example F77 program |
zbrent.f | zbrent.c ]
Homework 4
Model Atmosphere Assignment
(spline, splint, splie2, splin2 F77 codes)
(spline, splint, splie2, splin2 C codes)
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Spectra
The spectrograph, design and characterization
Reduction and analysis
Line formation, line broadening, profile shapes
The curve of growth
Fitting lines: Gaussian, Voigt, rotation, microturbulence
Abundance measurements
Observed abundance trends
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Homework 5
(voigt.f F77 code)
Homework 6
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