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                 Radio pulsars in double-neutron-star systems provide the best tests of strong-field gravitational theories.  This talk will present observations of PSR B1534+12 made using high-precision instrumentation at the Arecibo observatory.  The timing observations yield multiple tests of general relativity.  A recent advance is a measurement of the rate of geodetic precession in this system, via profile shape changes. This measurement also provides the full orbital geometry of the binary, which can in turn be used to constrain its evolution.  Similar observations of the new double-pulsar system are underway at the Green Bank Telescope.
		 Refreshments will be served at 3:30
 Tuesday, November 16th
 Seminar is to be held at 4:00 PM in the conference room
 on the second floor of Dearborn Observatory
 
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