Review of Sun

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Review of Sun
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Yellow Giant

• What weighs more 4H or 1He?
• Still burns H through shell
• Gasping for life
• Super Giant
• Outer shell is pulled outwards due to high
  luminosity
• No more H

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Our Sun

• Applet 1

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Mass

• How does the mass affect stars?
• Temp. of core
• Radius
• Luminosity
• Color
• Life span
• High mass shorter life
• Low mass longer life
• Why?

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Mass
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Mass

• Applet 2

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Fate of High Mass Stars

• Birth by larger gas clouds
• Only takes 100 million years to burn H core
• Immediately goes to pulsating star
• Continuously fuses heaver and heavier elements

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Fate of High Mass Stars
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Fig. 13.18
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Fate of High Mass Stars

• 5. Eventually produces iron
• a. Iron does not release energy
• 6. Pressure decreases
• 7. Core continues to collapse
• 8. Protons bind with electrons
• 9. Gravity and lack of pressure
• 10. Earth to Town

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Fate of High Mass Stars

• 11. Temperate skyrockets
• 12. Star explodes
• 13. Supernova
• 14. Neutron Star or Black hole

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Fig. 13.3
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CNO Cycle

• C N ? N gamma
• N ? C e
• C H ? N gamma
• N H ? O gamma
• O ? N e
• N H ? C He

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Fate of High Mass Stars

• Applet 3