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   PR # 11033
    We have not discuss about detailed spectra of the X-ray binaries with
    low luminosity (below 10^36erg/sec) because the sensitivities of the
    detectors onboard past satellites were low. So, we propose to observe
    X-ray novae in quiescent state including a neutron star and a black
    hole,of which position and distance are well known.These observations
    become possible by ASCA,for the first time, which has a hundred times
    better sensitivity than past detectors with an energy band up to 10
    keV. We can clarify the radiation mechanism of X-rays in such a low
    luminosity source which we have never seen and the outburst mechanism
    of novae. Moreover, we expect to discover the similarity or the
    difference of the physical phenomena depending on the compact star.

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