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Issue A&A
Volume 475, Number 2, November IV 2007
Page(s) 639 - 642
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20078108



A&A 475, 639-642 (2007)
DOI: 10.1051/0004-6361:20078108

A note on the cyclic evolution of the pulsar magnetosphere

I. Contopoulos

Research Center for Astronomy, Academy of Athens, 11527 Athens, Greece
    e-mail: icontop@academyofathens.gr

(Received 18 June 2007 / Accepted 10 September 2007)

Abstract
Positive and negative pulsar breaking indices suggest that some fraction of the pulsar spindown torque undergoes a cyclic evolution. The observed strong correlation of "anomalous" breaking indices with pulsar age implies that the characteristic periodicity timescale is in the range 100 to 10 000 years depending on the fraction of the spindown torque that undergoes cyclic evolution, 1 to 100% respectively. We argue that the longest variability timescale is consistent with a neutron star magnetic cycle similar to the solar cycle.


Key words: stars: pulsars: general -- stars: magnetic fields



© ESO 2007

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