Abstract
Abstract A new objective automated method for identification of OB associations and star complexes is proposed. It is suitable for a reliable comparison of the stellar groups in nearby galaxies. The method was applied for the galaxy M33. The criterion identifies three hierarchic groups in M33: OB association, aggregates, and star complexes. The select stellar groups show strong correlations with the HII regions in M33. The average size of the stellar associations, aggregates, and star complexes are 80 pc, 190 and 600 pc, respectively.
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