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We calculate and discuss the chemical evolution of the isotopic siliconabundances in the interstellar medium at distances and times appropriate to thebirth of the solar system. This has several objectives, some of which arerelated to anomalous silicon isotope ratios within presolar grains extractedfrom meteorites; namely: (1) What is the relative importance for siliconisotopic compositions in the bulk ISM of Type II supernovae, Type Iasupernovae, and AGB stars? (2) Are $^{29}$Si and $^{30}$Si primary or secondarynucleosynthesis products? (3) In what isotopic direction in a three-isotopeplot do core-collapse supernovae of different mass move the silicon isotopiccomposition? (4) Why do present calculations not reproduce the solar ratios forsilicon isotopes, and what does that impose upon studies of anomalous Siisotopes in meteoritic silicon carbide grains? (5) Are chemical-evolutionfeatures recorded in the anomalous SiC grains? Our answers are formulated onthe basis of the Woosley \& Weaver (1995) supernova yield survey.Renormalization with the calculated interstellar medium silicon isotopiccomposition and solar composition is as an important and recurring concept ofthis paper. Possible interpretations of the silicon isotope anomalies measuredin single SiC grains extracted from carbonaceous meteorites are then presented.The calculations suggest that the temporal evolution of the isotopic siliconabundances in the interstellar medium may be recorded in these grains.Comment: Accepted ApJ. 41 pages including 13 figures and 2 tables. uuencoded  gzipped postscrip

Galactic Evolution of Silicon Isotopes: Application to Presolar SiC Grains from Meteorites