Ch 11-03 Evolution of High-Mass Stars

• Stars of MS mass larger than about 8 M_⊙ can have carbon/neon burning and further stages of nuclear fusion.
  Elements up to iron (⁵⁶Fe) are created.
  
  
  
  
• Mass-loss from a supergiant
  
  
  
  
  
  
• Core-collapse supernova explosion
  
  Contraction of the iron core
      photodisintergration: γ+Fe --> α's
      electron capture: p+e^- --> n+ν
  Formation of a neutron-rich core
  Core bounce
  
  
  
  The energy content is about 10⁵³erg; EM waves carry only about 1%.
  Elements havier than iron are produced (this is the only way to create them!)
  
  
• Overview of stellar evolution