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1 2007

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The Optical Gravitational Lensing Experiment. Variable Stars in the Field of Open Cluster NGC 6755

Ciechanowska A., Pietrzyński G., Kołaczkowski Z., Wyrzykowski Ł., Szewczyk O., Kubiak M., Udalski A., Szymański M. K.

Acta Astronomica

2007

Vol. 57, No. 3

249--266

We present the results from a search for variable stars in the field of a young open cluster NGC 6755. Altogether seventy one variable stars have been discovered. Thirty one of them are eclipsing systems. This group contains ten EA, four EB and seventeen EW-type systems. Photometric variability of four late type stars is most probably caused by their chromospherical activity. Another seven detected variable stars have light curves typical for pulsating stars from the main instability strip. Four of them we tentatively classified as γ Dor, one as δ Sct and two as Population II Cepheid variable stars, respectively. Star designated as V40 can be either another population II Cepheid or an ellipsoidal binary system. The remaining twenty eight variable stars found in the field of this open cluster are most probably highly obscured background red giants (OSARG, irregular). For all detected variable stars we provide their light curves, preliminary classification, discussion on the possible cluster membership, equatorial coordinates, finding charts and periods when possible.