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The probability imaging technique applied to double stars speckle data is presented within the frame- work of a new approach, giving more directly the intensity ratio and relative position of the components. The twofold probability density function is used for this purpose. A theoretical model is developed, pointing out a relevant quantity deduced from the twofold probability density functions of the binary system and a nearby reference star. A method using this quantity is proposed to reconstruct the binary system, together with a reference-less version of it. The practical implementation of the method is tested for limiting cases and is improved by numerical simula- tions. Making use of the resulting procedure, intensity ra- tios and relative positions of the components are obtained for three close binary stars: Del, Moa¨ 1 = SAO 12917 and Per.

Speckle imaging of binary stars: Use of ratios of twofold probability density functions