Abstract
It is generally suspected that multiple systems and galactic clusters are objects of different kinds. Their frequency distribution as a function of the number of components, n, as well as their sizes and their masses, show important differences between both categories and also the probable existence of a limit lying between n = 10 and n = 20 components. The basic difference between these objects seems to be that the multiple systems appear to be components of the stellar medium in the same way as single and double stars, whereas the galactic clusters are groups of components of a particularly dense part of this medium.
