Astr 221 October 29, 2003: Magnitude and Wavelengths  

Question: What might skew temperature readings based on color?

Extinction is not just for dinosaurs

Extinction and Reddening

Question: What can we learn from spectra?

Classifying stars by spectra

Question: What do we need to produce Balmer lines?

Series graph

Standard Stars of known Spectral types

Spectral types graph continued

Spectral Types

Classification of Stellar Spectra

Ionization graph

Relative Spectral Strengths

Ionization Energies

Spectral Type descriptions

The H-R diagram

Hipparcos Satellite Parallaxes