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The tidal interactions in binary stellar systems are studied under the assumption that the orbital motion of the binary is negligible in comparison with the stellar motion. By integrating over time the tidal forces acting on the stars, the energy changes are derived. These are used to obtain simple analytical expressions for the rates of disruption and merging. This method gives appropriate value for the Roche density ρ R and it is found that the disruption rate of a satellite of density ρdoi:10.1007/bf02719525 fatcat:63agu7irpze2tdp3dtyf32g47u