An accretion disk model for periodic timing variations of pulsars

  title={An accretion disk model for periodic timing variations of pulsars},
  author={Guo-jun Qiao and Y. Q. Xue and Ren-xin Xu and H. T. G. Wang and Bo-Wen Xiao},
  journal={Astronomy and Astrophysics},
The long term, highly periodic and correlated variations in both the pulse shape and the rate of slow down of two isolated pulsars (PSRs) PSR B1828 11 and PSR B1642 03 were discovered recently. This phenomenon may provide evidence for "free precession" as suggested in the literature. Some authors presented various kinds of models to explain this phenomenon within the framework of free precession. Here we present an accretion disk model for this precession phenomenon instead. Under reasonable… 

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