The catalogue of structural and dynamical characteristics of 103 open star clusters and the firstresults of its investigation

Abstract

Abstract The catalogue of structural and dynamical characteristics of 103 open dusters (OC1's) is presented. These characteristics were obtained by improved star counts method with the use of available photometrical data. The catalogue contains numbers of stars in the dusters up to B ≃ 16m, the angular and linear radii of the OC1's, the King model parameters for the surface star density distribution and dimensionless parameters of the halo-core structure of the clusters, the lower estimates of the mass, tidal radius in the gravitational field of the Galaxy and the relaxation time of the dusters. The individual disruption times and nonstationary degrees for OCL's were calculated for the first time. The comparison is made with the results of theoretical studies and numerical experiments. A sequence is found in the space of the parameters of the halo-core structure of the dusters: the relative population and relative size of the duster core. This sequence or correlation corresponds to the balance of the rates of stellar transitions that take place between the core and the halo during the duster relaxation. The age dependence of the concentration of stars to the duster centre is confirmed. Some evidence of gravitational tidal actions of gas-star complexes (GSC's) on the clusters is found. First, the young duster stars are located deeper than the intermediate-age and old cluster ones, under the tidal surface that is determined by the Galaxy field. Second, the dependence of young duster sizes on the distance to the centre of the GSC that contained the dusters is found. It is confirmed that the giant molecular clouds gave the main contribution to the duster disruption. The tidal gravitational field of the GSC reduces the duster disruption time.