All known O-associations have been transformed into a single synthetic "association" with one nucleus by the method suggested earlier. The stellar density distribution for O-B0.5 and O-B1 stars, then, has been derived for this synthetic association. The density distribution is presented, as the first approximation, by the law d(r)~r^-3, where d(r) is the stellar density and r - the distance from the nucleus. This law is a good approximation, however, only in the average sense. In more precise approximation the stellar density distribution cannot be presented by one single law r^-n, with constant n. The exponent n, in fact, increases with the distance r. The stellar density distribution around the nuclei of O-associations, therefore, is presented better by the "hyperbolic" law: (lgd)^2=(2lgr-a)^2-b^2, where a and b are constants.
Communications of the Byurakan Astrophysical Observatory
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