INTEGRAL Observations of SS433: Analysis of Precessional and Orbital X-Ray Periodicities

Sternberg Astronomical Institute, Universitetsky pr. 13, 119992, Moscow, RussiaABSTRACTHard X-ray INTEGRAL observations of SScarried outduring 2003-2005 years are presented. Analysis of pre-cessional and orbital variability is presented. The widthof X-ray eclipse in the25− 50 keV range at the preces-sional phase ψ= 0.1(accretion disk is open to observer)is higher than that in the Ginga 18.4 − 27.6 keV range.This fact suggests existance the presence of hot extendedcorona around the supercritical accretion disk. Spectrumof hard X-rays in the range10−200keV does not changewith the precessional phase which also suggests that hardX-ray flux is generatedin the hot extended corona aroundthe accretion disk. The parameters of this hot corona are:kT= 23−25 keV, τ= 1.8− 2.8. Mass ratio estimatedfrom the analysis of the ingress part of the eclipse lightcurve is in the range q= m