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- W3099857576 abstract "We report the discovery of X-ray eclipses in the recently discovered accreting millisecond X-ray pulsar Swift J1749.4-2807. This is the first detection of X-ray eclipses in a system of this type and should enable a precise neutron star mass measurement once the companion star is identified and studied. We present a combined pulse and eclipse timing solution that enables tight constraints on the orbital parameters and inclination and shows that the companion mass is in the range 0.6-0.8 M_sun for a likely range of neutron star masses, and that it is larger than a main sequence star of the same mass. We observed two individual eclipse egresses and a single ingress. Our timing model shows that the eclipse features are symmetric about the time of 90 deg longitude from the ascending node, as expected. Our eclipse timing solution gives an eclipse duration (from the mid-points of ingress to egress) of 2172 +/- 13 s. This represents 6.85% of the 8.82 hr orbital period. This system also presents a potential measurement of Shapiro delay due to General Relativity; through this technique alone, we set an upper limit to the companion mass of 2.2 M_sun." @default.
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- W3099857576 date "2010-06-23" @default.
- W3099857576 modified "2023-09-29" @default.
- W3099857576 title "DISCOVERY OF ECLIPSES FROM THE ACCRETING MILLISECOND X-RAY PULSAR SWIFT J1749.4-2807" @default.
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