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   PR # 41165
   The ``soft excess'' is a very common feature in the X-ray spectra of
   Seyfert 1 galaxies. Nevertheless no unifying interpretative scheme
   has been assessed up to now. We propose to observe ESO198-G24 because
   it has a strong and variable soft excess. ESO198-G24 is a typical
   Seyfert 1 which s hows dramatic flux changes at different
   wavelenghts. ROSAT revealed a factor of 3 variation of flux in two
   6-months separated observations, and correlated variability of the
   soft-excess. However, the quality of the ROSAT data do not allow to
   distinguish between a variation of a "warm absorber" or a variation
   of a soft continuum emission (e.g. a black-body emission). These
   results concur in making ESO198-G24 a very attracting target to
   investigate the soft X-ray properties of Seyfert 1 with ASCA.
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