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Recent studies show the possibility of the formation of fairly regular andglobal spiral patterns in dwarf galaxies (dS type). Our sample of observeddwarf objects of this class also includes galaxies with a central stellar bar.The analysis of the observational data provides a small rotation velocity and asmall disk component mass for dS galaxies, which is in poor agreement with thespiral structure generation mechanism in isolated dwarfs due to the developmentof disk gravitational instability. Numerical simulation of the stellar-gaseousdisks self-consistent dynamics imposes restrictions on the stellar diskthickness and the maximum gas rotation velocity, at which the gravitationalmechanism of spiral formation can still be effective.

Formation of spiral dwarf galaxies: observational data and results of numerical simulation