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We derived O, Ne, and Mg abundances in the interstellar medium (ISM) of arelatively isolated S0 galaxy, NGC 4382, observed with the Suzaku XISinstruments and compared the O/Ne/Mg/Fe abundance pattern to those of the ISMin elliptical galaxies. The derived temperature and Fe abundance in the ISM areabout 0.3 keV and 0.6--2.9 solar, respectively. The abundance ratios arederived with a better accuracy than the abundances themselves: O/Fe, Ne/Fe, andMg/Fe ratios are 0.3, 0.7, and 0.6, respectively, in solar units. The O/Feratio is smaller than that of the ISM in elliptical galaxies, NGC 720, NGC1399, NGC 1404, and NGC 4636, observed with Suzaku. Since O, Ne, and Mg arepredominantly synthesized by supernovae (SNe) of type II, the observedabundance pattern indicates that the contribution of SN Ia products is higherin the S0 galaxy than in the elliptical galaxies Since the hot ISM inearly-type galaxies is an accumulation of stellar mass and SN Ia products, thelow O/Fe ratio in the ISM of NGC 4382 reflects a higher rate of present SNe Ia,or stars containing more SN Ia products than those in elliptical galaxies.

The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku