On the existence of groups of pairs of galaxies having different physical and kinematical characteristics

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Galactic Clusters, Galactic Evolution, Ubv Spectra, Astronomical Models, Kinematics, Stellar Motions

Scientific paper

Forty-seven pairs of galaxies, most of which are close or interacting, have been considered. All these pairs may be divided into three separate groups according to specific relations between the (U-B) color indices of their members. Comparison of spectral types, absolute magnitudes, radial velocities, and other characteristics of the pair members support the reality of existence of such groups. Evidence is given that the groups considered differ in origin or evolution.

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