Statistics – Computation
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2404b&link_type=abstract
American Astronomical Society, HEAD meeting #10, #24.04
Statistics
Computation
Scientific paper
We suggest that accretion-powered millisecond pulsars that show intermittency are aligned or nearly aligned rotators. The properties of the emitting region on the surfaces of such neutron stars are determined by the geometry and strength of the star's magnetic field and where accreting plasma enters the magnetosphere and are expected to change with time as the accretion flow in the inner disk changes. Our X-ray emission and general relativistic ray-tracing computations show that if these stars are aligned or nearly aligned rotators, modest changes in the location and shape of the emitting region can explain the observed sudden appearance and disappearance of pulsations (intermittency). This model can also explain why accretion-powered periodic oscillations have not been detected from many neutron stars in low-mass X-ray binary systems that produce nearly periodic nuclear-powered X-ray oscillations and are therefore thought to have dynamically important magnetic fields. This explanation of intermittency can be tested by comparing the correlated changes of waveform properties it predicts with observations. This research was supported in part by NASA grant NAG 5-12030, NSF grant AST 0709015, and funds of the Fortner Endowed Chair at Illinois, and by NSF grant AST 0708424 at Maryland.
Boutloukos Stratos
Clare Alexander
Dorris Daniel
Lamb Frederick K.
Miller Michael Coleman
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