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2002MNRAS.334..345Z - Mon. Not. R. Astron. Soc., 334, 345-354 (2002/August-1)
Timing analysis of the isolated neutron star RX J0720.4-3125.
ZANE S., HABERL F., CROPPER M., ZAVLIN V.E., LUMB D., SEMBAY S. and MOTCH C.
Abstract (from CDS):
The study of the spin history and the measure of the spin-down rate are of extreme importance in discriminating between the possible mechanisms suggested for the nature of the X-ray emission. The value of P{dot}, here measured for the first time, is ~10–14s.s–1. This value cannot be explained in terms of torque from a fossil disc. When interpreted in terms of dipolar losses, it gives a magnetic field of B~1013G, making it also implausible that the source is accreting from the underdense surroundings. On the other hand, we also find it unlikely that the field decayed from a much larger value (B ~1015G, as expected for a magnetar powered by dissipation of a superstrong field) since this scenario predicts a source age of ~104 yr, too young to match the observed X-ray luminosity. The observed properties are more compatible with a scenario in which the source is ~106 yr old, and its magnetic field has not changed substantially over the lifetime.
Abstract Copyright: 2002 Blackwell Science Ltd
Journal keyword(s): magnetic fields - stars: individual: RX J0720.4-3125 - stars: neutron - stars: oscillations - pulsars: general - pulsars: individual: RX J0720.4-3125
Simbad objects: 4
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