Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..nws.c3002r&link_type=abstract
American Physical Society, Fourth Annual Meeting of the Northwest Section, abstract #C3.002
Other
Scientific paper
The monitoring of long-term and periodic variations both in pulse shape and slow-down rate of the isolated pulsar PSR B1828-11 shows strong Fourier powers at periods of ˜= 1000, 500, 250 and 167 days, with the strongest one at period ˜= 500 days. The close relationship between the periodic changes in the beam shape and the spin-down rate of the pulsar draws the attention of people to precession of the spin axis in a rotating body. Here, we study the precession of PSR B1828-11 by considering the effect of coupling the rigid crust to the magnetic dipole and gravitational radiation torques. In particular, we show that the near-magnetic field radiation torque might be responsible for the longest (fundamental) observed precession period, while the far-magnetic field radiation and gravitational radiation torques may produce the other harmonics. Further, in a good agreement with data, we model the changes of the pulse shape in the precession cycle and find that the variation of pulse duration follows from a standard beam pattern in this cycle.
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