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Read Your Textbook: Foundations of Astronomy –Chapter 14, 15 Homework Problems Chapter 14 –Review Questions: 2, 4, 7, 9-11, 13 –Review Problems: 3, 6,

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Presentation on theme: "Read Your Textbook: Foundations of Astronomy –Chapter 14, 15 Homework Problems Chapter 14 –Review Questions: 2, 4, 7, 9-11, 13 –Review Problems: 3, 6,"— Presentation transcript:

1 Read Your Textbook: Foundations of Astronomy –Chapter 14, 15 Homework Problems Chapter 14 –Review Questions: 2, 4, 7, 9-11, 13 –Review Problems: 3, 6, 9 –Web Inquiries: 1 Homework Problems Chapter 15 –Review Questions: 5, 10, 14 –Review Problems: 2, 5, 7 –Web Inquiries: 2 End States

2 Supernovae

3 Type I: binary star system, white dwarf accreting material from a companion. Spectrum is hydrogen poor. Type II: massive stars that experience core fusion to iron, iron core collapses. Spectrum is hydrogen rich. Supernova Types

4 Main Sequence Stellar Mass END STATE 0.05 to 3 M sun He, C-O White Dwarf 3 to 8 M sun Supernova (Neutron Star) > 8 M sun Supernova (Black Hole) White Dwarf: Electron pressure holds up against gravity Neutron Star: Star is compressed until protons and electrons are crushed together into neutrons. Atomic nuclear pressure supports star against gravity. Black Hole: The ultimate gravitational collapse. Death By Mass

5 Fission and Fusion

6 White Dwarf Density

7 What is the maximum mass that can be supported by the compacted material of a white dwarf star? Chandrasekhar Mass Limit

8 Supernovae Remnant

9 Type I Supernova Creation

10 Type I Supernova Components

11 Radio emissions Pulsars

12 Pulsar Model

13 Binary Stars

14 Black Hole Detection

15 The distance from a black hole at which the escape speed is the speed of light. R = 2 GM/c 2 ObjectMass (solar)Black Hole Event Horizon Star1030 km Star 3 9 km Star2 6 km Sun1 3 km Jupiter cm Earth cm Schwarzchild Radius

16 Stellar Evolution Summary


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