class22a - Monday, Oct. 20 Syllabus, class notes, and...

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Monday, Oct. 20 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 10 The second exam will be this Friday. If you didn’t get a review sheet on Friday, there are more in the homework return boxes. The Wednesday help session is in GRG 424 at 5:00 (for the entire semester).
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Topics for this week Describe how a star (or protostar) changes if it generates more (or less) energy by nuclear fusion than it radiates from its surface. Describe the changes that occur near the center of a star as it changes from a main-sequence star into a red giant. Describe how a red giant becomes a planetary nebula and a white dwarf. How does the pressure inside a white dwarf differ from normal gas pressure? How does nuclear fusion inside of very massive stars differ from the fusion that will occur inside of the Sun? How do the processes that occur inside of massive stars lead to supernova explosions?
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Thermal Equilibrium in Stars Protostars are not in thermal equilibrium. They lose energy by radiation from their surfaces, but they aren’t hot enough inside to ignite nuclear fusion to replace the lost energy.
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class22a - Monday, Oct. 20 Syllabus, class notes, and...

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