Search for millisecond rotational periods in some low-mass X-ray binaries observed by EXOSAT

Astronomy and Astrophysics – Astronomy

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Binary Stars, Periodic Variations, Pulsars, Stellar Rotation, X Ray Binaries, X Ray Sources, Exosat Satellite, Magnetic Flux, Stellar Mass Accretion

Scientific paper

A search for millisecond rotational pulsations in the X-ray emission of the low-mass X-ray binaries MXB1728-34, 4U1702-42, 4U1705-44, 4U1755-33 and GX17+2 was conducted by the EXOSAT medium energy experiment argon counters (1 to 20 keV) with a time resolution of 7.8125 millisec. Periods in the range from 16 msec to 8 sec were sought. Upper limits of 1.5% to 5% are found at a 3 sigma level. The negative result of the search does not necessarily imply that the observed sources are not millisecond rotators. The magnetic field may be too weak to influence the accretion flow in a way to cause an observable modulation of the X-ray flux. Scattering by circumstellar material may smear out the X-ray pulsations. The periods may be outside the period search interval.

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