Organizing the Family of Stars: The Hertzsprung-Russell
Diagram
We know:
Stars have different
temperatures, different luminosities, and different sizes.
To bring some order into that zoo of
different types of stars: organize them in a diagram of
Luminosity
versus
Temperature (or spectral type)
Temperature
Spectral type: O
B A F
G K M
Hertzsprung-Russell Diagram
