Abstract
Abstract—The paper analyzes the origin for the separation of gas-and-dust disks around young stars into two large groups: those with circular and spiral structures. Such a separation of disk structures is explained by the existence of stable and unstable gas-dynamic equilibrium of protostellar envelopes. A model of wave disturbances of the gas-dust protostellar envelopes is constructed. The equation of the integrated average radiation intensity in the dust envelope of protostars is obtained. The radii of five protostars at the time of their observation and the time of their entry onto the Main Sequence were determined.
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