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    • Keywords


      Photoelectric photometry; eclipsing binaries; over-contact systems.

    • Abstract


      Photometric observations of the over-contact binary ER ORI were performed during November 2007 and February to April 2008 with the 51 cm telescope of Biruni Observatory of Shiraz University in U, B and V filters (Johnson system) and an RCA 4509 photomultiplier. We used these data to obtain the light curves and calculate the newtimes of minimum light in each filter and plot the O–C diagram of ER ORI. Using the Wilson’s computer code with the help of an auxiliary computer program to improve the optimizations, the light curve analyses were carried out to find out the photometric elements of the system.

    • Author Affiliations


      M. M. Lame’e1 B. Javanmardi2 N. Riazi2

      1. Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA, Leiden, The Netherlands.
      2. Department of Physics, Biruni Observatory, Shiraz University, Shiraz, 71454, Iran.
    • Dates

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