Based on the indications presented in our previous work dedicated to the classification of the Galactic star clusters, O type star clusters were selected from many star clusters observed in Byurakan, the list of which with detailed information on those stars is shown in Table 1. In addition, all the star clusters' brief description from the list is presented in this article. The research shows that the overwhelming majority of the already known 50-star clusters from the list are included in the already known O type associations as a nucleus. Probably all O type star clusters are nuclei of the O type associations. At the same time research shows that the number of O type stars in the galactic star clusters and multiple stars consist of 40% of the total number of these kinds of stars. Moving on to the Russell diagram's main sequence this percentage is quickly decreasing, practically reaching 0%. From this, we can conclude that the earlier the spectral class of the star is, the stronger is the tendency of their "accumulation".
Communications of the Byurakan Astrophysical Observatory
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