2002/05/31 by Vahid Rezania · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Atomic and Subatomic Physics Research #High-pressure geophysics and materials #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1051/0004-6361:20021774
published as Astron.Astrophys. 399 (2003) 653-658 · 11 pages, discussion is changed
arxiv created 2002/11/18 · openalex publication_date 2003/02/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Analysis of both pulse timing and pulse shape variations of the isolated pulsar PSR B1828-11 shows highly correlated and strong Fourier power at periods 1000, 500, 250, and 167 d (Stairs et al. [CITE]). The only description based on a free precession of the star's rigid crust coupled to the magnetic dipole torque, explains the 500 d-component, as the fundamental Fourier frequency, with its harmonic 250 d-component (Link & Epstein [CITE]). In this paper, we study a time-varying magnetic field model and show that if the dipole moment vector rotates with a period nearly equal to the longest (assumed fundamental) observed period (1000 d) relative to the star's body axes, the resulting magnetic torque may produce the whole Fourier spectrum consistently. We also find the second and fourth harmonics at periods 500 and 250 d are dominant for small wobble angle and large field's inclination angle ≥ . We note that, although our model simply explains the observed pulse timing and pulse shape variations of PSR B1828-11, it also evokes some serious problems with our currently understanding from the physics of the neutron star structure.