day_12 - September 27, 2010 Exam 2 This Friday. Review...

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September 27, 2010 Exam 2 This Friday. Review sheet posted. Review Thursday 5 PM room TBD Reading, Sections 6.4, 6.5, 6.6. 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 Chapter 7 will be on 3 rd exam. Astronomy in the News? Pic of the Day – false color image of Saturn from Cassini spacecraft
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Goal – to understand how white dwarfs in binary star systems can, and cannot grow to the Chandrasekar mass and explode.
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One Minute Exam We expect classical nova systems to end up making two white dwarfs orbiting one another because: The first white dwarf loses mass and hence cannot grow and explode The first white dwarf will accrete mass until it reaches the Chandrasekhar limit The main sequence star transferring mass must eventually make a white dwarf The second white dwarf has the Chandrasekhar mass
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Goal – to understand what happens to two white dwarfs in a binary system.
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We do observe 2 white dwarfs in orbit in some cases - is that the end? If you try to slow down an orbiting object what happens? No:
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This note was uploaded on 10/23/2010 for the course AST 47700 taught by Professor Wheeler during the Fall '10 term at University of Texas at Austin.

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day_12 - September 27, 2010 Exam 2 This Friday. Review...

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