Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112004l&link_type=abstract
American Astronomical Society, AAS Meeting #211, #120.04; Bulletin of the American Astronomical Society, Vol. 39, p.949
Astronomy and Astrophysics
Astronomy
Scientific paper
The reported behavior of the pulse frequencies of several accreting millisecond pulsars is puzzling in two respects. First, power spectral analyses of the accretion-powered X-ray emission of these pulsars indicate that during outbursts their pulse frequencies change much faster than the rate of change of their spin frequencies predicted by the standard model of the accretion torque. Second, their pulse frequencies show wild swings of both signs that are not correlated with the mass accretion rates inferred from their X-ray fluxes. We have computed the expected X-ray waveforms of pulsars like these, including special and general relativistic effects, and find that the changes in their waveforms produced by physically plausible changes in the flow of accreting matter onto their surfaces can explain their apparently anomalous spin-frequency behavior. We discuss the further implications of this result. 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 0098436 at Maryland.
Boutloukos Stratos
Clare Alexander
Dorris Daniel
Lamb Frederick K.
Miller Michael Coleman
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