Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1068..152c&link_type=abstract
A DECADE OF ACCRETING MILLISECOND X-RAY PULSARS. AIP Conference Proceedings, Volume 1068, pp. 152-159 (2008).
Other
3
Gravitational Radiation, Magnetic Fields, And Other Observations, Accretion And Accretion Disks, Pulsars, Neutron Stars
Scientific paper
The accreting millisecond pulsar HETE J1900.1-2455 is still undergoing a long accretion outburst in which pulsations were detected for only the first 70 days following the onset of accretion. We calculate the evolution of the magnetic field in the ocean of an accreting neutron star during and between transient outbursts. We find that at accretion rates of a few percent of the Eddington rate, the magnetic field in the ocean is reduced by a factor of 5-50 (depending on the ocean composition) over two months of accretion, potentially explaining the disappearance of pulsations in HETE J1900.1-2455. We show that changes in B of a similar magnitude are also expected in two other AMSPs, XTE J1814-338 and XTE J1751-305, which are not intermittent pulsators. If screening is operating in these sources, this difference could point to an intrinsically weaker field in HETE J1900.1-2455, or different ocean composition or surface gravity.
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