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   51030
   The protostar R1 in the R crA dark cloud exhibited a surprising
   feature: X-ray flares of about 10 keV temperature associated with two
   emission lines of 6.2 and 6.9 keV. This requires relativistic speed of
   jet, if this is due to Doppler split. Thus R1 would be particularly
   dynamical epoch of the protostar phase. In fact, hard X-ray flux from
   R1 dramatically decreased at the second observation. Also Infrared
   observations found disappearance of R1. This forces us to observed
   another example of protostars in the " R1 phase ". With ROSAT and
   infrared observations, we found good example, which is the hot spot at
   the Monoceros star forming region.
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