day_03 - September 1 2010 Reading assignment Cosmic...

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September 1, 2010 Reading assignment, Cosmic Catastrophes, Chapter 6 plus Section 5.1, Section 1.2.4 and Section 2.3 for background Last lecture posted as pdf on class web site Astronomy in the News? House threatens to cut funds for NASA science. 14 Nobel Prize winners, some astronauts, former NASA officials, 30 total, signed a letter in favor of President Obama’s proposed space program, altering plans of previous administration. Pic of the Day – Earth and Moon from perspective of Messenger satellite orbiting Mercury
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Electronic version of Cosmic Catastrophes No limit to access through UT library by means of UT eid and password (go to UT library online, search for Cosmic Catastrophes, click on “electronic resource”) Downloads and printing are limited to 20% of the content.
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Quantum Pressure -- just depends on squeezing particles, electrons for white dwarf, to very high density -- depends on density only -- does not depend on temperature Important Implication: Normal Radiate energy, pressure tries to drop, star contracts and gets hotter (and higher pressure) White Dwarf Radiate energy, temperature does not matter , pressure, size, remain constant, star gets cooler Opposite behavior put in energy, star expands, cools Normal Star - White Dwarf - put in energy, hotter, more nuclear burning -- explosion!
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