Hard X-ray pulse profile and period evolution of AO535 + 26 and GX 1 + 4 as observed by the Franco-Soviet Signe satellite experiments

Astronomy and Astrophysics – Astrophysics

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Bursts, Scientific Satellites, Stellar Oscillations, X Ray Binaries, Astronomical Photometry, Light Curve, Phase Deviation, Prognoz Satellites

Scientific paper

The source GX 1 + 4 and an outburst from the recurrent X-ray transient A0535+26 were observed in 1977 December by collimated detectors aboard the Prognoz 6 satellite (Signe 2MP experiment) in the energy range 28-308 keV and aboard the Signe 3 satellite between 27 and 108 keV. The temporal evolution of the pulsation period of these sources (107.22 s and 103.89 s respectively), the variations of the pulsed and total fluxes, and the light curves are given. A temporary disk model for A0535+26 is proposed.

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