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A few binary open clusters with visually separable components are known inthe Galaxy. However there can be dual systems that overlap in the line of sightand are seen as a single cluster. On the basis of the WEBDA database we studiedthe V-band magnitude distributions of stars of the open clusters in the Galaxy.Most of these distributions showed Gaussian-like shape with a single peak, butsome of them demonstrated two and more peaks which we considered as amanifestation of duality or multiplicity of the object. We examined themagnitude distributions of 563 rich open clusters from the WEBDA database withmore than 100 stars and revealed 70 of them with two and more statisticallysignificant peaks which we considered as binary and multiple clustercandidates. On the basis of these clusters we comprised a catalogue of possiblebinary and multiple clusters in the Galaxy overlapping in the line of sight.Geometric centres of cluster components and corresponding numbers of clustermembers were estimated.

Overlapping binary and multiple open cluster candidates in the Galaxy