class25a - Wednesday, Oct. 29 Syllabus, class notes, and...

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Wednesday, Oct. 29 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 11 The Wednesday help session is in GRG 424 at 5:00 (for the entire semester).
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Our Schedule Aug 27: Ch 1+App A The Scale of the Cosmos Sep 3: Ch 2+3 The Sky, Cycles in the Sky Sep 8: Ch 4 The Origin of Modern Astronomy Sep 15: Ch 5 Telescopes Sep 19: Exam #1, Ch 1-5 Sep 22: Ch 6 Starlight and Atoms Sep 29: Ch 7 The Sun Oct 6: Ch 8 The Family of Stars Oct 13: Ch 9 The Formation and Structure of Stars Oct 20: Ch 10 The Lives and Deaths of Stars Oct 24: Exam #2, Ch 6-10 Oct 27: Ch 11 Neutron Stars and Black Holes Nov 3: Ch 12 The Milky Way Galaxy Nov 10: Ch 15 Cosmology Nov 17: Ch 16 The Origin of the Solar System Nov 24: Ch 17 The Terrestrial Planets Dec 1: Ch 18 The Outer Solar System Dec 5: Exam #3, Ch 10-12,15-19
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Topics for this week Compare the two types of supernova: how do they differ in the cause of the explosion and in what is left behind? Describe neutron stars. Describe pulsars. Why do neutron stars rotate so quickly? Why couldn’t white dwarfs or other stars rotate as quickly? Define ‘escape speed’. Describe black holes. What evidence do we have that there is a very massive black hole at the center of the Milky Way?
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The collapse of a massive star Stars more massive than about 8 M sun can go through a series of fusion reaction leading up to iron. Fusion of iron absorbs energy instead of releasing it. That makes the Fe core unstable, and it collapses. As the core collapses, electrons fuse with protons in the Fe nuclei: p + + e - n + ν But this reaction absorbs even more energy, decreasing the pressure even more.
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class25a - Wednesday, Oct. 29 Syllabus, class notes, and...

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