Statistics of period for eclipsing binary systems

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Abstract
A statistical analysis of period distribution in eclipsing binary stars based on the spectral types of the components which takes into account the most relevant selection effects, is presented. Results are presented which are concluded to be in line with the fission theory for the origin of these systems. In addition, the results are shown to provide clear indications about evolutionary effects on the average separation. Finally, emphasis is given to the appearance of a marked bimodal distribution for the advanced spectral types

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