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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:The effect of accumulation of the mass is studied by numerical simulation of twodimensional
motions of a plane layer, and of a cylindrical and a spherical shells of a selfgravitating
gas. It is assumed that a layer or a shell are accelerated by the influence of a
difference of pressure on the both their sides. We introduce the parameter characterizing
both the relative influence of the gravity and the difference of the pressure on the morphology
of the condensations, and we determine the change of the integral mass of the condensations
with respect to the thickness of a layer. By means of the calculations it is shown that the
appearance of an inhomogeneous structure of the Galactic HII region RCW 82 may be
due to the instability of the shell, formed when the ionization and the shock fronts left the
cloud. Moreover, the time evolution of the instability is less than the estimated age of the
HII region.