Very earliest stars

• Recall, all elements heavier than H and He formed in stars

  • Fusion reactions
    • 4 H => He + energy
    • 3 He => C
    • C + He => O, etc.
  • Red Giant stars
    • make Si, Mg, etc.
  • Supernovae
    • make heavier elements, Fe up to U
  • Example: “Rotten Egg Nebula”
    • see News story on Ast 104 WWW site
      • Hubble Space telescope infrared images
    • UR infrared images (vu-graph)
      • K-band (2200 nm) beautiful guitar-shaped nebula
        • starlight scattered off dust which is being spewed into space

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