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day_17 - Reading Chapter 7 Chapter 8 Sections 8.1 8.2 8.5...

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October 13, 2010 Reading Chapter 7, Chapter 8 - Sections 8.1, 8.2, 8.5, 8.6, 8.10 Astronomy in the News? Chilean mine rescue in Atacama desert, site of new telescopes. Pic of the Day – Hubble, Escher, Venice
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Goal: To understand how isolated neutron stars are observed as “pulsars.”
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New results from NASA Fermi Observatory , launched June 2008, that detects high-energy Gamma Rays Radio may come from magnetic poles, but most of the power is in high-energy gamma rays and occurs in regions beyond the neutron star, near the speed of light circle.
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Goal: To understand how neutron stars behave in accreting binary systems.
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Radio pulsars are alone in space or in non-transferring binary system Vast majority of known radio (and gamma-ray) pulsars are alone in space ~ two dozen have binary companions Binaries special - use Kepler’s laws to measure mass Orbital decay Gravitational Radiation - Nobel Prize 1993
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Some neutron stars are in binaries with mass transfer Mass transfer floods the magnetic field/poles with gas/plasma, short circuits, kills the radio (and gamma-ray) mechanism.
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