EXOSAT observations of 4U1705-44

During a 7 hr observation of 4U1705-44, 6 intensity dips, which show a quasiperiodicity of 1.3 hr were detected. There are intensity fluctuations in the range of 100 to 500 sec. These timescales may be interpreted in terms on an orbital period and oscillations of an accretion disk, respectively. The source spectrum (nondip and dip data) can be fitted by a Wien-Boltzmann function with a superimposed iron emission line at 6.2 + or - 0.2 keV. The temperature decreases from 2.93 keV to 2.68 keV during the dips. This behavior can be explained as a partial occultation of the extended X-ray source caused by a bulge (hot spot) at the edge of an accretion disk around the neutron star.