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We report the results of CCD photometric observations in the direction of theComa Berenices and Upgren 1 open clusters with the aim at searching for newshort-period variable stars. A total of 35 stars were checked for variability.As a result of this search the star designated in the SIMBAD database asMelotte 111 AV 1224 was found to be a new eclipsing binary star. Follow-upStr\"omgren photometric and spectroscopic observations allowed us to derive thespectral type, distance, reddening and effective temperature of the star. Apreliminary analysis of the binary light curve was performed and the parametersof the orbital system were derived. From the derived physical parameters weconclude that Melotte 111 AV 1224 is most likely a W UMa eclipsing binary thatis not a member of the Coma Berenices open cluster. On other hand, we did notfind evidence of brightness variations in the stars NSV 5612 and NSV 5615previously catalogued as variable stars in Coma Berenices open cluster.

new astronomy

Searching for short-period variable stars in the direction of Coma  Berenices and Upgren 1 open clusters: Melotte 111 AV 1224 a new eclipsing  binary star