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   PR # 21054
    In the ROSAT image of the Vela Supernova Remnant 3 extended features 
    have  been detected outside of the remnant's boundary.  The symmetry 
    of the  3 features indicates a common origin close to the Vela pulsar
    position,  which suggests the interpretation of the shrapnels being  
    expelled in the  Vela SN explosion. The shock waves associated with  
    their supersonic motion  heat the underlying gas to X-ray temperature
    s. We propose to observe with  ASCA the shrapnel of highest surface  
    brightness.The size is 4 x 8 arcmin; the ROSAT count rate is 0.3 cps.
    With the high spectral resolution of ASCA it will be possible to det-
    ermine the radiation process, most likely thermal, the temperature / 
    density / pressure distributions and eventually the  abundances assoc
   iated with the Vela progenitor
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