neutronstars - Announcements Homework #7 due today Test #3...

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1 Announcements • Homework #7 due today • Test #3 Next Thursday, Nov 10 1. White Dwarf If initial star mass < 8 M Sun or so. (and remember: Maximum WD mass is 1.4 M Sun , radius is about that of the Earth) 2. Neutron Star If initial mass > 8 M Sun and < 25 M Sun . 3. Black Hole If initial mass > 25 M Sun . Final States of a Star WR104 - Looking Down the Barrel of a GRB system 8000 lt-years from us Pulsars Discovery of LGM1 by Jocelyn Bell and Tony Hewish (Cambridge) in 1967. Nobel Prize to Hewish in 1974. Pulse periods observed from 0.001 sec to 10 seconds - DEMO Explanation: “beamed” radiation from rapidly spinning neutron star. Usually neutron stars are pulsars for 10 7 years after supernova. Study the Universe, See the World Jocelyn Bell and Alan Rogers at URSI-2011 meeting in Istanbul The Crab Pulsar
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2 The Crab Pulsar Chandra X-ray image On Off The Crab Pulsar Chandra X-ray image On Off Neutron Stars Leftover core from Type II supernova - a tightly packed ball of neutrons. Diameter: 20 km only! Mass: 1.4 - 3(?) M Sun Density: 10 14 g / cm 3 ! 1 teaspoon = 1000 great pyramids Surface gravity: 10 12 higher Escape velocity: 0.5c Rotation rate: few to many times !! per second!!! Magnetic Feld: 10 12 x Earth’s! A neutron star over the Sandias? General Relativistic de±ection of light
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neutronstars - Announcements Homework #7 due today Test #3...

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