Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-24
Astronomy and Astrophysics
Astrophysics
15 pages, 5 figures
Scientific paper
10.1086/321581
Pulse timing of the isolated pulsar PSR B1882-11 shows strong Fourier power at periods ~1000, 500 and 250 d, correlated with changes in the pulse profile (Stairs, Lyne & Shemar 2000). We study the extent to which these data can be explained by precession of the star's rigid crust coupled to the magnetic dipole torque. We find that the correlated changes in the pulse duration and spin period derivative can be explained as precession at a period of ~500 d with a wobble angle of ~3 deg if the star's dipole moment is nearly orthogonal to its symmetry axis. The dipole torque produces a harmonic at ~250 d. Comparison of the predicted spin dynamics with the observed pulse durations requires the radio beam to have a non-standard ``hour-glass'' shape. We make predictions of variations in beam polarization and pulse profile with which to test this interpretation. The precession interpretation of PSR B1828-11 seriously challenges the current understanding of the liquid interior of the neutron star. In particular, if the internal liquid is in a superfluid state, its rotational vortices cannot be significantly pinned to the crust.
Epstein Richard I.
Link Bennett
No associations
LandOfFree
Precession Interpretation of the Isolated Pulsar PSR B1828-11 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Precession Interpretation of the Isolated Pulsar PSR B1828-11, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precession Interpretation of the Isolated Pulsar PSR B1828-11 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-604944