The battle against the inexorable force of gravity ... lost. Part II.

Definitions:
Intermediate: 2-8 solar masses. Radiative structure
High mass stars: more than 8 solar masses. Convective core + radiative mantle.

How massive do stars get?
Upper limit set by radiation pressure:
a star more massive than about 100 solar masses will blow itself apart.
Breaking News! Stellar masses cannot exceed 150 solar masses

• Evolution of Massive Stars
  • 
    Helium capture
  • 
    Onion skin model
  • 
    Nuclear stability
  • 
    Blowing off steam
  • 
    Supernovae
  • The stellar graveyard: Neutron Stars and Black Holes

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• Pulsating Variable Stars
  • 
    Instability Strip
  • 
    Cepheids
    
    Period proportional to luminosity
  • RR Lyrae
  • delta Scuti