Astronomy 210
Lecture 31, April 9 Spring 2018

Lecture Notes: pdf file

Stellar Spectra and the Hertzsprung-Russell Diagram

Mass, Luminosity, and Lifespan

  • Mass-luminosity relation plotted for main sequence stars
  • implications for HR diagram
    HR diagram comparison: nearest vs brightest (highest flux) stars

The Life Cycle of of a 1 Msun star

  • protostar birth in molecular clouds
  • adulthood: the main sequence
  • Red giants and implications for HR diagrams like this and this
  • Helium flash
  • Helium burning: horizontal branch
  • Death throes: asymptotic giant branch
  • 1Msun HR diagram: evolutionary path, animation

Testing Stellar Evolution Theory: Star Clusters

 M45: The Pleiades Star Cluster

Lecture Archive

Brian D. Fields
Last modified: Fri Apr 8 12:05:13 CDT 2011