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   PR # 41007
   We propose to observe hard X-ray emission from the young stellar
   objects (YSOs) in roh-oph east (L1689) dark cloud. In this region,
   there are more than ten YSOs whose infrared classes are from Class I
   (protostars) to Class III (weak-line T Tauri stars), including
   extremely young protostar, IRAS 16293-2422. The X-ray emission from
   YSOs provides us direct information on the surface magnetic
   activities of YSOs even though they are deeply embedded in the
   molecular cloud cores. The purpose of our observations are (1) to
   search for the hard X-ray emission toward protostars, (2) to make a
   comparison in X-ray spectrum between protostars and T Tauri stars,
   and (3) to make clear at what stage of protostellar evolution the
   X-ray activities start.
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