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We present constraints on theoretical models of Type Ia SNe using spatiallyresolved ASCA X-ray spectroscopy of four galaxy clusters: Abell 496, Abell2199, Abell 3571 & Perseus. All four clusters have central Fe abundanceenhancements and an ensemble of abundance ratios are used to show that most ofthe Fe in the central regions of the clusters comes from SN Ia. At the centerof each cluster, simultaneous analysis of spectra from all ASCA instrumentsshows that the Ni to Fe abundance ratio (normalized by the solar ratio) is ~ 4.We use the Ni/Fe ratio as a discriminator between SN Ia explosion models: theNi/Fe ratio of ejecta from the "Convective Deflagration" model W7 is consistentwith the observations, while those of "delayed detonation" models are notconsistent at the 90% confidence level.Comment: 5 pages, html, to appear in the proceedings of the 10th Annual  October Astrophysics Conference in Maryland "Cosmic Explosions!", October  199

Constraining SN Ia models using X-ray spectra of clusters of galaxies