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The study of open star clusters makes us understand a lot about thecomposition and construction of the Milky Way Galaxy. Thanks to the Gaia DR2database that helps us to get the genetic members of star clusters using theirproper motions and parallaxes, estimating their physical properties in a veryaccurate way. This study aims to detect the reasons that make proper motionsvalue of a cluster is completely separated from the background field stars andnot melted in. We studied a large sample of open stellar clusters taken fromDias catalog and drawing the vector point diagrams using the astrometric dataof Gaia DR2. Marking the separated clusters and melted ones and study theirmean parameters in each galactic quadrant.

Open clusters with proper motions fully separated from the field stars using Gaia DR2