Galactic Subsystems on the Basis of Cumulative Distribution of Space Velocities

Galactic Subsystems on the Basis of Cumulative Distribution of Space Velocities

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A sample containing $4,614$ stars with available space velocities and high-quality kinematical data from the Arihip Catalogue is formed.For the purpose of distinguishing galactic subsystems the cumulative distribution velgen vff 12 of space velocities is studied.The fractions of the three subsystems are found to be: thin disc 92%, thick disc 6% and halo 2%.These results are cashel tail bag verified by analysing the elements of velocity ellipsoids and the shape and size of the galactocentric orbits of the sample stars, i.e.

the planar and vertical eccentricities of the orbits.