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Classical Spin-Orbit Coupling and Periastron Advance in a Binary Pulsar

Show simple item record Kaspi, V. M. en_US Bailes, M. en_US Manchester, R. N. en_US Stappers, B. W. en_US Bell, J. F. en_US 2004-09-30T15:57:37Z 2004-09-30T15:57:37Z 1996 en_US
dc.identifier.clearanceno 96-0461 en_US
dc.description.abstract We report on radio timing observations of PSR J0045-7319, and eccentric pulsar/B star 51-day binary in the Small Magellanic Cloud. Significant deviations from a simple Keplerian orbit, observed as precessions of the periastron longitude and orbital plane, are identified with classical spin-orbit coupling and apsidal advance, for the fist time in a binary pulsar. Both precessions result from the B star's rotationally-induced gravitational quadropole moment, however, the orbital plane precession requires the B star's spin axis to be inclined with respect to the orbital angular momentum. We constrain this inclination angle (theta) to be 25° <(theta)<41°. Under the conventional assumption that the pre-supernova angular momenta were aligned, our observations provide the most direct evidence yet for an asymmetric supernova. en_US
dc.format.extent 566081 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject.other radio timing psr j0045-7319 pulsars binary pulsars small magellenic cloud en_US
dc.title Classical Spin-Orbit Coupling and Periastron Advance in a Binary Pulsar en_US

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