Disentangling the neighbouring pulsars SXP 15.3 and SXP 305

SXP 15.3 and 305 are two Be X-ray binaries in the Small Magellanic Cloud that spatially separated by ~7 arcsec. The small separation between these sources has, past, resulted confusion about origin of emission from combined region. We present long-term optical monitoring results both sources, where we study historic recent behaviour. In particular, data collected as part S-CUBED project see repeating outbursts region lightcurve Neil Gehrels Swift Observatory, investigate this emission. Using H-alpha line Southern African Large Telescope (SALT) photometric flux Optical Gravitational Lensing Experiment (OGLE) to changes size structure disc, demonstrate likely originates 15.3. Timing analysis reveals unusual behaviour, outburst profile shows modulation at twice frequency outbursts. consider either periodicities being true orbital period propose models based on geometric orientations disc neutron star explain physical