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    PR # 31020                                                                   
     X-Ray Probing of  Protostars   With the PV phase observation of the R       
     ho-Oph dark cloud, we found hard X-ray  emission from embedded infrar       
     ed sources, which may be protostars  ( pre-stage of T- Tauri star). O       
     ne hard source shows a  flare and other shows  sinusoidal variation i       
     ndicating rapid rotation  of the protostar.    Our proposal is to con       
     firm  this time variability ( whether it is regular  sinusoidal varia       
     tion or not) and to make higher spatial resolution  observation ( obs       
     erve at  on axis position)  to resolve source confusion  and to searc       
     h for X-rays  from a younger object in the Rho-Oph cloud.                   
                                                                                 
                                                                                 
                                                                                 
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