Abstract
Spatial density parameters ofz-distribution and luminosity dispersion in the HR diagram for nine stellar spectral groups (A-K III, A-G IV, A-F V) were determined. It was shown that all stars considered can be divided into two subsets according to their scale-height β. For the younger stars β is of the order of 100–150 pc, and for older ones of 300–400 pc. The accuracy of the parameters derived was evaluated with use of numerical simulations. We found that for subgiants and dwarfs the relative error in the local density makes 10 to 15%, and for giants it is a little higher (20 to 25%). For other parameters the typical error is of the order of 20–30%.
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