Lecture10 - Astro Nova Antarctic robotic observatory...

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Astro Nova Antarctic robotic observatory established 13,400’ elevation 4x 6”optical telescopes aurora monitor mm radio telescope Mercury Meteorites? new escape calculations ~ 6 existing meteorites? angrites? Lunar Eclipse last night
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First Exam Tuesday March 11 5:00 pm – 6:20 pm Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 5.3, 6.1, 6.2, 16 - 21 Lectures 1-14 (January 22 through March 6) Bring Student ID card and a #2 pencil Practice Exam on class web page
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Previous Lecture Stellar evolution is a consequence of the change of their composition produced by nuclear reactions <0.08 M Sun objects become brown dwarfs 0.08 – 0.04 M Sun objects consume hydrogen on MS, and end up as helium white dwarfs White dwarfs are high density compact objects supported by degeneracy pressure 0.4 – 3.0 M Sun objects become red giants with H fusion shells after MS life At tip of RG branch, He fusion starts, produces horizontal branch stars
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Quiz Question 1 How does a 0.2 M Sun star end its life? A. as a brown dwarf B. as a white dwarf C. as a black hole D. in a gigantic explosion E. As a main sequence star
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Quiz Question 2 Degeneracy pressure arises from A. nuclear fusion reactions B. nuclear fission reactions C. the temperature of a very dense gas D. the reluctance of two electrons to share the same space E. the reluctance of two dirty old men to share the same raincoat
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Quiz Question 3 Stars evolve because: A. nuclear reactions change their chemical composition B. nuclear reactions change their mass C. nuclear reactions change their temperature D. gravitational energy makes them rotate E. only the fittest stars survive
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Lecture10 - Astro Nova Antarctic robotic observatory...

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