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   PR # 11007
    We propose observations of three Herbig Ae/Be stars, which are class-
    ified as O9-B0 stars and should have sufficient brightness to be
    detected by ASCA. Herbig Ae/Be stars are young stars of intermediate-
    mass(2-10 solar mass). No observations of them in the X-ray band have
    been reported so far in spite of their importance in investigating
    the evolution of proto-planetary systems and intermediate-mass stars
    themselves. The proposed observations will provide important infor-
    mation about (1)the presence (or absence) of different mechanism for
    activities of Herbig Be stars from that for normal B stars, (2) the
    activities and mass-loss rates of these Herbig Be stars, and (3) the
    spatial distributions of circumstellar materials around them.

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