End States Read Your Textbook: Foundations of Astronomy

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Presentation transcript:

End States 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

Supernovae

Supernova Types 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.

Death By Mass Main Sequence Stellar Mass END STATE 0.05 to 3 Msun He, C-O White Dwarf 3 to 8 Msun Supernova (Neutron Star) > 8 Msun 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.

Fission and Fusion

White Dwarf Density

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

Supernovae Remnant

Type I Supernova Creation

Type I Supernova Components

Pulsars Radio emissions

Pulsar Model

Binary Stars

Black Hole Detection

Schwarzchild Radius The distance from a black hole at which the escape speed is the speed of light. R = 2 GM/c2 Object Mass (solar) Black Hole Event Horizon Star 10 30 km Star 3 9 km Star 2 6 km Sun 1 3 km Jupiter 0.00009 28 cm Earth 0.000003 0.9 cm

Stellar Evolution Summary

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