Table of Contents
Journal of Astrophysics
Volume 2015, Article ID 590673, 8 pages
Research Article

An Extensive Photometric Investigation of the W UMa System DK Cyg

1Astronomy Department, National Research Institute of Astronomy and Geophysics, Helwan, Cairo 11421, Egypt
2Physics Department, College of Science, Northern Border University, Arar 1321, Saudi Arabia
3Physics Department, Faculty of Applied Science, Umm Al-Qura University, Makkah 715, Saudi Arabia

Received 25 August 2014; Revised 14 December 2014; Accepted 17 December 2014

Academic Editor: Theodor Pribulla

Copyright © 2015 M. M. Elkhateeb et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


DK Cyg is a contact binary system that undergoes complete eclipses. All the published photoelectric data have been collected and utilized to reexamine and update the period behavior of the system. A significant period increase with rate of 12.590 × 10−11 days/cycle was calculated. New period and ephemeris have 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.