Discovery of 101-s Pulsations from AX J0057.4-7325 in the SMC with ASCA
  The results from two ASCA observations of AX J0057.4-7325 = RX J0057.3-7325 are presented. Coherent pulsations with a barycentric period of 101.45 +/- 0.07 s were discovered in the second observation. The X-ray spectrum was found to be hard (photon index ~ 0.9) and unchanged through these observations, except for the flux. The ROSAT archival data show that AX J0057.4-7325 exhibits a flux variation with a factor >~ 10. A discussion on a possible optical counterpart is given. 
Jun Yokogawa (1), Ken'ichi Torii (2), Takayoshi Kohmura (3), Kensuke   Imanishi (1), Katsuji Koyama (1) ((1) Kyoto Universit...