******************************************************                         
    PR # 31025                                                                   
     To know the star formation history and the initial mass function, the       
      Orion complex is the most accessible laboratory for the study of low       
       to high mass young stars. We have been conducting extensive optical       
      survey observations of the Orion region in a search for emission- li       
     ne stars, and outside of the cloud, we detected far more samples than       
      previously known. Follow-up observations confirmed that many of them       
      are classical T Tauri stars. However, to complete our knowledge of l       
     ow-mass young stars in the Orion, we should investigate "weak" T Taur       
     i stars, which have been discovered as X-ray emitter in other star fo       
     rming clouds. We will propose to survey X-ray sources in the Ori OB1b       
      association.                                                               
                                                                                 
  ******************************************************