EC for unit 3

EC for unit 3 - Society in January 2004 when he visited...

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Amanda Ferencz AST3033 March 10, 2008 Extra Credit for Unit III Part I 1. The progenitor was detected in X - rays before the supernova explosion was spotted visually. 2. If this location is exact, this supports the now popular theory that type Ia supernovae are the result of a normal star pouring matter onto a close white-dwarf companion, until that collapsed star's mass exceeds the Chandrasekhar Limit of 1.39 solar masses. 3. But a second theory says that these explosions are the result of the merger of two white dwarf , in which case there would be no prior exchange of material between the dense stars, so no matter produced beforehand. Part II 1. Magnetars are a special class of young, slowly spinning neutron stars, left by type II supernovae. They are special due to strong burst of X- rays, which first called attention to them about a decade ago. It was Pensacola native Dr. Robert Duncan,
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now an astronomer at the University of Texas in Austin, who discovered and named them. He had just won the Rossi Prize from the American Astronomical
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Unformatted text preview: Society in January 2004 when he visited Pensacola and gave a talk on them to the EAAA (see attachment). 2. The "dual nature" object is PSR J1846-0258 , located in the constellation Aquila ; as would be expected, it lies in a young supernova remnant, Kes 75 , and as a pulsar normally pulses 3 times a second, slow for a pulsar so young. The older Crab Nebula Pulsar, created in 1054 AD supernova in Taurus, by contrast pulses 30 times a second. 3. The supernova that created this strange object occurred one year ago, so this suggests that this magnetar phase is short lived, with the object stabilizing into a longer lasting pulsar within a few thousand years. Whether all type II supernova produce such magnetars will now be a subject of new research. In particular, the famed SN 1987A in the Large Maganellic Cloud may soon have the SN remnant clear enough for observations of the collapsed object at its core....
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EC for unit 3 - Society in January 2004 when he visited...

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