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We present a proper motion investigation of a sample of Be star candidatestowards the Magellanic Clouds, which has resulted in the identification ofseparate populations, in the Galactic foreground and in the Magellanicbackground. Be stars are broadly speaking B-type stars that have shown emissionlines in their spectra. In this work, we studied a sample of 2446 and 1019 Bestar candidates towards the LMC and SMC respectively, taken from the literatureand proposed as possible Be stars due to their variability behaviour in theOGLE-II I band. JHKs magnitudes from the IRSF catalog and proper motions fromthe SPM4 catalog, were obtained for 1188 and 619 LMC and SMC Be starscandidates, respectively. Color-color and vector-point diagrams were used toidentify different populations among the Be star candidates. In the LMC sample,two populations with distinctive infrared colours and kinematics were found,the bluer sample is consistent with being in the LMC and the redder one withbelonging to the Milky Way disk. This settles the nature of the redder samplewhich had been described in previous publications as a possible unknownsubclass of stars among the Be candidates in the LMC. In the SMC sample, asimilar but less evident result was obtained, since this apparent unknownsubclass was not seen in this galaxy. We confirm that in the selection of Bestars by their variability, although generally successful, there is a higherrisk of contamination by Milky Way objects towards redder B$-$V and V$-$Icolors.

Proper motion separation of Be star candidates in the Magellanic Clouds and the Milky Way