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ASCA observed the central region of the Small Magellanic Cloud, and found ahard X-ray source, AX J0051-733, at the position of the ROSAT source RXJ0050.8-7316, which has an optical counterpart of a Be star. Coherent X-raypulsations of 323.1 +/- 0.3 s were discovered from AX J0051-733. The pulseprofile shows several sub-peaks in the soft (0.7-2.0 keV) X-ray band, butbecomes nearly sinusoidal in the harder (2.0-7.0 keV) X-ray band. The X-rayspectrum was found to be hard, and is well fitted by a power-law model with aphoton index of 1.0 +/- 0.4. The long-term flux history was examined with thearchival data of Einstein observatory and ROSAT; a flux variability with afactor > 10 was found.Comment: 6 pages, 5 figures, accepted for publication in PAS

ASCA Discovery of a Be X-Ray Pulsar in the SMC: AX J0051–733