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day_06 - Exams will be returned Wednesday answers posted on...

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September 13, 2010 Exams will be returned Wednesday, answers posted on web page. Sky Watch - working together is encouraged, but you must write up independent reports in your own words. Reading, Sections 6.2, 6.3. Sections 1.2, 2.1, 2.4, 2.5 for background. Astronomy in the News? End of Ramadan last Friday, September 10, marked by crescent Moon. Pic of the Day – Milky Way Galaxy and Zodiacal light from dust in Solar System
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Goal To understand how a massive star gets from hydrogen to iron, and why iron?
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Origin of Type II, Ib. Ic How does a massive star get from hydrogen to iron, and why iron, and what then?
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Discussion point: What do you know about iron?
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Evolution - gravity vs. charge repulsion § 2.1 Discussion point: Why do you have to heat a fuel to burn it? H He C O more protons, more charge repulsion, must get ever hotter to burn ever “heavier” fuel Just what massive stars do! Support by thermal pressure. When fuel runs out, core tries to cool but gravity squeezes, core contracts and HEATS UP overcomes higher charge repulsion, burns new, heavier fuel, until get to iron Figure 2.1
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