ABSTRACT
In present-day astrophysics the analysis and understanding of internal motion in stars, the evolution of stars, and the evolution of various nebulae are impossible within the framework of the dynamics of discrete material point systems or within the scope of hydrostatics of liquid mass. Preliminary analysis showed that for explaining celestial phenomena it is insufficient to use known gas motion phenomena; new models are required to solve new gas dynamics problems. Stellar magnitude defined by means of an apparatus equally sensitive to all wavelengths, with corrections for absorption in the terrestrial atmosphere and in instrument optics, is called bolometric. Spectroscopic measurements based on the Doppler effect show that variation of cepheid brightness is accompanied by variation, with the same period, of ray velocity of radiating gas particles, which is indicative of the radial gas motion in the photosphere of cepheids.
