An Extensive Photometric Investigation of the W UMa System DK Cyg
  DK Cyg (P = 0.4707) is a W Ursae Majoris type eclipsing binary system that undergoes complete eclipses. All the published photoelectric data have been collected and utilized to re-examine and update the period behavior of the system. A significant period increase with rate of 12.590x10-11 day/cycle was calculated. New period and ephemeris has been calculated for the system. A long term photometric solution study was performed and a light curve elements were calculated. We investigated the evolutionary status of the system using theoretical evolutionary models. 
M. M. Elkhateeb, M. I. Nouh, E. Elkholy and B. Korany
astro-ph.SR