Modelling of eclipsing binaries

W Ursae Majoris-type (W UMa-type) variable stars are contact eclipsing binary stars \nwhose evolution is unknown. Modelling to determine the physical parameters of as many \nW UMa-type variable stars as possible might provide some insight as to how these contact \nbinaries form and evolve. The All Sky Automated Survey (ASAS) has discovered over \n ve thousand of these systems. Using data from the ASAS and from the Wide Angle \nSearch for Planets (SuperWASP) project, models of selected ASAS contact binaries are \nbeing created to determine their physical parameters. Some W UMa-type variable stars \nare known to undergo changes in orbital period. For selected ASAS contact binaries, a \nperiod analysis has been performed using SuperWASP data to determine if the systems \nare undergoing changes in orbital period. Results of the modelling and period analyses of \nselected systems are presented.