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We investigate high-magnification events caused by wide binary stellar andplanetary systems under the moderately strong finite-source effect where thediameter of the source star is comparable with the caustics induced by a binarycompanion and a planet. From this investigation, we find that a characteristicfeature in the central perturbations induced by the binary systems commonlyappears in a constant range where the size of the caustic induced by the binarycompanion is between 1.5 and 1.9 times of the diameter of the source, whereasin the central perturbations induced by the planetary systems the featurecommonly appears in a range where the ratio of the size of the caustic inducedby the planet to the source diameter changes with the planet/primary massratio. High-magnification events caused by the binary and planetary systemswith the characteristic feature produce a distinctive short-duration bump inthe residuals from the single-lensing light curve, where the bump occurs nearthe time of peak magnification of the events. Because of a well-knownplanet/binary degeneracy, we compare binary- and planetary-lensing events withthe short-duration bump in the residuals. As a result, we find the features ofthe binary-lensing events that are discriminated from the planetary-lensingevents despite the moderately strong finite-source effect and thus can be usedto immediately distinguish between the binary and planetary companions. We alsofind the feature that appears only in binary-lensing events with a very lowmass ratio or planetary-lensing events. This implies that the lens systems withthe feature have a very low mass binary companion (such as a brown dwarf) or aplanet.

Distinguishing central perturbations by binary stellar and planetary systems under the moderately strong finite-source effect