Fedorova E. Effects of microlensing and structure of gravitational lens systems

The thesis deals with modelling and analyse of extragalactic gravitational microlensing observances. Image centroids and lightcurves of different sources were modelled up in cases of single and binary lens with shear and convergence. Full number of them was modelled for different trajectories of lens, in dependence from shear and convergence. Accuracy of parameters determining from lightcurve fit using approximations for magnification near caustic was analysed intensively. Some parameters of "Einstein Cross" were determined from lightcurves observed by OGLE and GLITP. Dragging effect of extragalactic reference frame due to weak microlensing by Galaxy masses was modelled. Contributions of Solar system bodies to coordinates of extragalactic sources were taken into account by construction of relativistic reference frame in weak field approximation.