By Flügge S. (ed.)
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This theory abandoned the idea of a local system, and assumed that in the most flattened sub-system the dispersion of the velocities is everywhere small compared with the systematic motion relative to the centre of gravity of the system as a whole, which can be identified with a general motion of rotation about the distant centre. The asymmetrical drift was interpreted as due to a decrease of the velocity of rotation with increasing dispersion of the relative velocities in the sub-system, and was explained quantitatively by the existence of a general "effective" limit of the 1 2 B.
The deviations from the form of the stationary state may be defined by a deformation of the effective boundary in the equatorial plane and by general variations of the internal distribution of density, and we have to take into account the variations of the gravitation potential due to such variations. As the formation of stars and dust out of the gas in a primitive system will mean a reduction of the pressure in the e xtended mediu m, and a greater concentration of matter towards the equatorial 1 W.
The essential difference with the presentation in Sects. 7 and 8 ist that, in addition to differential rotations represented by <9 we have motions in the radial directions specified by a velocity 77 proportional to R. A consequence is that we shall have a K, term proportional to the distance (positive or negative) in the radial velocities case of spherical velocity distributions is developed in an approach to a general explanation of spiral structure. The a5 Bertii. Lindblad : Sect. 10. Galactic Dynamics.
