Abstract
From an analytical viewpoint, the superposition of two stellar velocity distribution functions and the set of central velocity moments up to fourth order are studied. For the Galaxy, any specific type of symmetry or differential movement has not been assumed. General expressions of the total central moments starting from the partial ones, which are associated with both distribution function components, are obtained and, when each component is quadratic in peculiar velocities and of Schwarzschild type, the constraints between the total central moments are studied
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