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Chapter Twenty/Twenty-One

Chapter Twenty/Twenty-One. Questions for the Day. What are the end states of stars? How do stars interact?. What are the end states of stars?. When nuclear fuel is exhausted, hydrostatic equilibrium is upset causing the star to collapse.

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Chapter Twenty/Twenty-One

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  1. Chapter Twenty/Twenty-One

  2. Questions for the Day • What are the end states of stars? • How do stars interact?

  3. What are the end states of stars? • When nuclear fuel is exhausted, hydrostatic equilibrium is upset causing the star to collapse. • Depending on the amount of material the stars will end up as: • White Dwarfs (< 1.5M) • Neutron Stars/Black Holes (1.5M)

  4. Hydrostatic Equilibrium

  5. A Nova

  6. Mass-Radius Relationship White Dwarfs

  7. Evolution of White Dwarfs

  8. Supernova in NGC 4725

  9. Stellar Evolution: Supernova

  10. Light Curve of a Supernova

  11. Supernova 1987a

  12. Cassiopeia A

  13. Crab Nebula

  14. Mass – Luminosity of Neutron Stars

  15. Joycelyn Bell Burnell • 1943 – • Born in Belfast, Ireland • Grew up in the countryside and studied physics and astronomy • Graduated Cambridge Univsersity in England Nobel Prize Women in Science, Sharon Bertsch McGrayne, Citadel Press, 1993

  16. Jocelyn Bell Burnell’s Work • Worked under Anthony Hewish at the 2.5 acre radio telescope at Cambridge • Studied object that varied in the radio with the telescope. • Hewish and Burnell discovered an object that varied on a time scale of 1.3 seconds. • Hewish won Nobel prize in 1974 for the discovery of Pulsars.

  17. Radio Signal from CP 1919

  18. Diagram of Pulsar

  19. A Black Hole

  20. How do interact? • Star interact by creating binary or multiple star systems. • Types of Binary Stars: • Visual: One can observe the two stars using a telescope. • Spectroscopic: One can use spectroscopy to observe the stars. • Eclipsing: One can use light curves to observe the stars.

  21. Appearance of Curved Spacetime

  22. Light in Black Hole

  23. Spectroscopy of Binary Stars

  24. Spectroscopy of Binary Stars

  25. Visual versus Spectroscopic

  26. Light Curves of Binary Stars

  27. Various Binary Stars Star Light Program From Dan Bruton

  28. Roche Lobes of Binary Stars

  29. Black Hole and Star

  30. Homework 9 • Explain why two main differences between neutron stars and white dwarfs occur. • Page 492, CQ 3, 9, 24 • Page 517, CQ 8, 15

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