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We have analyzed ASCA data of 27 early-type galaxies, and studied theproperties of their X-ray emitting ISM (Inter Stellar  Medium) in detail. We found that overlapping lines and free-bound continuumcause strong coupling in the derived abundances of various elements. Theabundance determination is also difficult due to the uncertainties in the Fe-Latomic physics, because Fe-L lines couple with O and Ne K-lines. However, whenabundances of $\alpha$-elements are fixed, all the plasma codes give similar Feabundances with a scattering of only 20-30%. To relax the strong coupling amongthe elements, we included 20% systematic errors in the Fe-L region of thespectra. Then, in X-ray luminous galaxies, the derived abundance of Fe and$\alpha$-elements both became $\sim 1$ solar within a factor of 2. This resultrelaxes the previous severe discrepancy between the ISM and stellarmetallicities. The ISM metallicity in X-ray fainter galaxies is stilluncertain, but we can at least constrain that contribution from type-Ia SN tothe ISM abundance is lower than in X-ray luminous systems. These resultsstrongly suggest that a large fraction of SN Ia products have escaped intointergalactic space.Comment: 48 pages with 20 figures, Latex(PASJadd.sty, PASJ95.sty), accepted  for publication in PAS

Metal Abundances in the Hot Interstellar Medium in Early-Type Galaxies Observed with ASCA