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Chapter 12: The Deaths and Remnants of Stars

by: Ashley Notetaker

Chapter 12: The Deaths and Remnants of Stars 41087 - AST 115 - A

Marketplace > Missouri State University > Physics 2 > 41087 - AST 115 - A > Chapter 12 The Deaths and Remnants of Stars
Ashley Notetaker

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About this Document

Chapter 12 puts the cap on the section of stars. Everything you need to know about White Dwarf, Black Holes, and more. Don't miss out on this valuable information!
Basic Astronomy
Robert S Patterson
75 ?




Popular in Basic Astronomy

Popular in Physics 2

This 2 page Bundle was uploaded by Ashley Notetaker on Friday November 6, 2015. The Bundle belongs to 41087 - AST 115 - A at Missouri State University taught by Robert S Patterson in Fall 2015. Since its upload, it has received 18 views. For similar materials see Basic Astronomy in Physics 2 at Missouri State University.


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Date Created: 11/06/15
White Dwarfs: Diameter :~ 10, 000 km (earth size) Mass: < 1.4 Solar Mass Avg. Density: 20 tons/in^3 Observations of Stellar Explosions: 1. Planetary Nebula *Bubble of gas expanding @ 100 km/sec *hot, low luminosity blue-white star @ center *1/2 Ly across 2. Nova *Gas from explosion expanding @ 1,000 km/sec *A star or stellar system that brightens suddenly b 100,000X its original value *After months it gradually fades back to obscurity. 3. Supernova Type Ia: Peak M = -19, Spectrum = no spectral lines Type II: Peak M = -17, Spectrum = spectral lines *Gas from explosion expanding @ 10,000 km/sec *A star or stellar system that brightens suddenly by 100 milX its original value *After months it gradually fades back to obscurity. Post-Main Sequence Evolution of High & Very High Mass Stars: 8 < mass < 25 Solar Mass = High Mass > 25 = Very High (@ 25 either high or very high) *High & Very High mass stars can achieve additional levels of fusion, bc their greater mass allows higher temps to be attained in the contracting core. Evolution Scenario for a 25 Solar Mass Star: *High mass makes core temp & fusion run faster *Carbon is fused into neon in just 600 years *Silicon is fused into iron in just 1 day Stellar Explosions: Explanations of Phenomena’s : White Dwarf & Planetary Nebula: *A low mass star loses its envelope as a “planetary nebula” after becoming a Red Giant for a 2 time. *The core is left behind as a “white dwarf” *Nebula fades after 100,000 years. *White Dwarf is done w/ fusion but the electrons in it have been squeezed into a “degenerate gas” & support. *Eventually white dwarf cools and turns into black dwarf Nova: *White Dwarf is in a close binary system w/ Red Giant *H from Red Giant overflows its “Roche Lobe” & falls into accretion disk *H eventually falls onto surface of White Dwarf, where it heats & explodes fro H fusion *Both stars Survive Supernova: Type Ia: *Same as Nova except, white dwarf is just under Chandrasekhar mass limit 1.4 Solar mass. *Accretion of H from companion causes entire white dwarf to gravitationally collapse & undergo huge explosion. Type II: *High mass star reaches end of evolution. *Iron core suffers gravitational collapse *Then a huge explosion of entire star. *Emission of tremendous E & huge #s of neutrinos


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