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SUMMARY:Are there Magnetars among Long-period X-ray Pulsars? - Nazar Ikhsa
 nov (NASA/Marshall)
DTSTART:20100318T113000Z
DTEND:20100318T120000Z
UID:TALK23786@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:About a couple of tens galactic X-ray sources display regular 
 pulses\, with periods in a range of 500-20000s. They are identified with m
 assive close binaries in which a magnetized neutron star accretes material
  onto its surface. The observed pulsations are unambiguously associated wi
 th the spin period of the neutron star. Analysis of the observed spin-evol
 ution and possible history of these pulsars in terms of currently adopted 
 spin-down model suggests that the field strength of the neutron star excee
 ds the quantum critical level and hence these objects are magnetars. If th
 is finding were correct a major revision of the magneto-rotational evoluti
 on model would be required. In my talk I show\, however\, that the observe
 d behavior of the pulsars can reflect a more complicated structure of the 
 accretion flow surrounding their magnetospheres. A solution we get in this
  case is consistent with currently used evolution model of close binaries.
LOCATION:Large Martin Ryle Seminar Room\, KICC
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