class28a - Wednesday Nov 5 Syllabus class notes and...

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Wednesday, Nov. 5 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 12 The Wednesday help session is in GRG 424 at 5:00 (for the entire semester).
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Topics for this week Describe the Milky Way Galaxy Describe the Standard Candle method of determining distances and how Cepheid variable stars are used as standard candles. Describe how astronomers measure the distribution of mass in the Milky Way and what they find. Explain why we might expect the spiral arms in the Milky Way to become more tightly wrapped and how density wave theory solves this problem. Describe the various types of galaxies, both normal and active, and how they differ from the Milky Way
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Our place in the Milky Way Harlow Shapley (about 1920) Determined the constant of proportionality between period of variation and luminosity, so the luminosity of a Cepheid variable star could be determined from its period. Then he could use Cepheid variables as standard candles. He mapped out the distribution of globular clusters. He found that they formed a distribution centered some
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class28a - Wednesday Nov 5 Syllabus class notes and...

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