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Galactic stars belonging to the Of?p category are all strongly magneticobjects exhibiting rotationally modulated spectral and photometric changes ontimescales of weeks to years. Five candidate Of?p stars in the MagellanicClouds have been discovered, notably in the context of ongoing surveys of theirmassive star populations. Here we describe an investigation of theirphotometric behaviour, revealing significant variability in all studied objectson timescales of one week to more than four years, including clearly periodicvariations for three of them. Their spectral characteristics along with thesephotometric changes provide further support for the hypothesis that these arestrongly magnetized O stars, analogous to the Of?p stars in the Galaxy.

Photometric identification of the periods of the first candidate extragalactic magnetic massive stars