lecture26 - Astronomy Picture of the Day Inner region of...

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Astronomy Picture of the Day Inner region of the spiral galaxy M74, as seen by Hubble
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Announcements Final exam: Monday Dec. 10, 1:30-3:30 pm Scantron, 50 questions The exam will cover the entire course, with about 2/3 of the questions from material after the midterm exam Seating chart will be posted on the class web site
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Trivia Question a) less than 1% b) 1% - 5% c) 5% - 10% d) 10% - 20% e) more than 20% What percentage of the US federal budget goes to NASA?
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recap: stages of evolution of a sunlike star Main sequence: H burning to He in the core
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recap: stages of evolution of a sunlike star Main sequence turn- off: All of the H in the core has been converted to He
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recap: stages of evolution of a sunlike star First ascent up the red giant branch: H fusing to He in a shell around the core
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recap: stages of evolution of a sunlike star When the core temperature reaches 100 million K, He begins to fuse into C in the core
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Final stages of evolution for stars like the sun Helium in the core has all been fused into carbon and some oxygen The core doesn’t reach high enough temperatures to fuse carbon to even heavier elements Helium fusion still continues in a shell around the core The star makes a second ascent up the red giant branch and its radius and luminosity increase dramatically In this stage, the sun’s radius will be large enough to engulf Venus and possibly Earth
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evolution of a sunlike star When the He in the core is exhausted, He begins to fuse to C in a shell around the core, and H to He in a shell surrounding that. The star moves up the
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lecture26 - Astronomy Picture of the Day Inner region of...

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