Ejnar Hertzsprung
Astronomy 404
Lecture 5, Sept. 1 Fall 2021 Henry Norris Russell

Lecture Notes: pdf file

Photons in Thermal Equilibrium: Blackbody Radiation

A Census of Stars: the Hertzsprung-Russell Diagram

Gaia HR Diagram for 4+ million stars (DR2)

Lecture Archive


Brian D. Fields