Summary
A photometric program to estimate the frequency of close unresolved companions in visual binary systems has been developed. The sensitivity of the detection depends on the accuracy of the differential photometric measurements of binary components. Unresolved companions up to seven magnitudes fainter than the primary are detectable in theBVRI photometric system.
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Rakos, K.D., Franz, O.G. Photoelectric observations of CPM stars in theBVRI system. Astrophys Space Sci 142, 123–129 (1988). https://doi.org/10.1007/BF00656192
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DOI: https://doi.org/10.1007/BF00656192