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One of the goals of the XMM-Newton survey of the Small Magellanic Cloud isthe study of the Be/X-ray binary population. During one of our first surveyobservations a bright new transient - XMMUJ004814.0-732204 - was discovered. Wepresent the analysis of the EPIC X-ray data together with optical observations,to investigate the spectral and temporal characteristics ofXMMUJ004814.0-732204. We found coherent X-ray pulsations in the EPIC data witha period of (11.86642 +/- 0.00017) s. The X-ray spectrum can be modelled by anabsorbed power-law with indication for a soft excess. Depending on themodelling of the soft X-ray spectrum, the photon index ranges between 0.53 and0.66. We identify the optical counterpart as a B = 14.9mag star which wasmonitored during the MACHO and OGLE-III projects. The optical light curves showregular outbursts by ~0.5 mag in B and R and up to 0.9 mag in I which repeatwith a time scale of about 1000 days. The OGLE-III optical colours of the starare consistent with an early B spectral type. An optical spectrum obtained atthe 1.9 m telescope of the South African Astronomical Observatory in December2009 shows H_alpha emission with an equivalent width of 3.5 +/- 0.6 A. TheX-ray spectrum and the detection of pulsations suggest thatXMMUJ004814.0-732204 is a new high mass X-ray binary pulsar in the SMC. Thelong term variability and the H_alpha emission line in the spectrum of theoptical counterpart identify it as a Be/X-ray binary system.

The XMM-Newton survey of the Small Magellanic Cloud: Discovery of the 11.866 s Be/X-ray binary pulsar XMMUJ004814.0-732204 (SXP11.87)