Query : 2003A&A...399..653R

2003A&A...399..653R - Astronomy and Astrophysics, volume 399, 653-658 (2003/2-4)

On the precession of the isolated pulsar PSR B1828-11. A time-varying magnetic field.


Abstract (from CDS):

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 167d (Stairs et al., 2000Natur.406..484S). The only description based on a free precession of the star's rigid crust coupled to the magnetic dipole torque, explains the 500d-component, as the fundamental Fourier frequency, with its harmonic 250d-component (Link & Epstein, 2001ApJ...556..392L). 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 (≃1000d) 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 250d are dominant for small wobble angle ≃3° and large field's inclination angle ≥89°. 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.

Abstract Copyright:

Journal keyword(s): pulsar: individual: PSR B1828-11 - stars: neutron - stars: magnetic fields

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 PSR B1642-03 Psr 16 45 02.0330 -03 17 57.200           ~ 337 0
2 PSR B1828-10 Psr 18 30 47.566 -10 59 27.90           ~ 151 1

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