ASCA observations of Mrk 1040 & MS 0225 . 5 + 3121 3

We present ASCA observations of the Seyfert 1 galaxies Mrk 1040 and MS 0225.5+3121. Mrk 1040 was found to have decreased in ux by almost a factor of 4 since an EXOSAT observation 10 years ago. The energy spectrum of Mrk 1040 displays complexity both at soft energies (below 0.8 keV) and at hard energies (6{7 keV). The latter is readily interpreted as uorescent K emission from cold iron expected when the primary X-ray source illuminates cold optically-thick material. This line is both broad (with FWHM 16 000{70000 km s 1) and strong (equivalent width 550 250 eV) suggesting that it originates from material close to the compact object with non-solar abundances. Abundance eeects on the equivalent width of such a line are investigated via Monte Carlo simulations. We nd that strong lines can be produced with physically plausible abundances. The eeect of abundances on the associated reeection continuum is also discussed. The soft spectral complexity implies either a strong soft excess together with intrinsic absorption, or a complex absorber. Various models for the nature of such a complex absorber are discussed. MS 0225.5+3121 shows no evidence for any variability and has a spectrum that is well described by a power law with Galactic absorption.