day_11 - September 24, 2010 Exam 2 Friday, October 1...

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September 24, 2010 Exam 2 Friday, October 1 Reading, Sections 6.4, 6.5, 6.6. Chapter 7 will be on 3 rd exam. Sections 1.2, 2.1, 2.4, 2.5, 3.3, 3.4, 3.5, 3.10 (binary stars), 4.1, 4.2, 4.3, 4.4 (accretion disks), 5.2, 5.4 (cataclysmic variables) for background Astronomy in the News? Yesterday was the Equinox as well as Full Moon, making that a Super Harvest Moon. Jupiter will stay in the Eastern evening sky, the nearly full Moon will pass it again in a month. Docking latches on International Space Station would not release Soyuz lander, stranding two Russians and an American temporarily. Pic of the Day – Super Harvest Moon from Hungary
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Goal To understand how stars, and Type Ia supernovae, evolve in binary systems.
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In common circumstances for binary star systems, all the hydrogen envelope is transferred to the companion (or ejected into space), leaving the core of the red giant as a white dwarf orbiting the remaining main sequence star WD MS
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First star evolves, sheds its envelope, leaves behind a white dwarf. Then the second star that was originally the less massive evolves, fills its Roche Lobe and sheds mass onto the white dwarf. The white dwarf is a tiny moving target, the transfer stream misses
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day_11 - September 24, 2010 Exam 2 Friday, October 1...

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