Phase-Density Fluctuations at the Centers of Six Open Clusters

Details Phase-Density Fluctuations at the Centers of Six Open Clusters Phase-Density Fluctuations at the Centers of Six Open Clusters

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..514d&link_type=abstract

Astronomy Reports, Volume 54, Issue 6, pp.514-527

Astronomy and Astrophysics

Astronomy

Scientific paper

Instability of proper fluctuations of the phase density at the centers of six open clusters is demonstrated. The boundaries of the region of instability in terms of the mean mass densities of the cluster cores are determined. Estimates for a number of dynamical parameters (the potential, velocity dispersion of the stellar motions, mass density, phase-density fluctuation period, time for the development of instability of the fluctuations, etc.) are obtained for the central parts of these clusters, as well as for numerical dynamical models for open clusters. Equation that can be used to estimate the dynamical mass of a cluster taking into account the influence of the external field of the Galaxy and the non-stationarity of the cluster is derived. Allowance for these effects makes it possible to decrease the dynamical masses of clusters compared to the virial masses assuming isolated systems. Astrophysical applications of the results are discussed.

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