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We present mid-infrared Spitzer spectra of eleven planetary nebulae in theGalactic Bulge. We derive argon, neon, sulfur, and oxygen abundances for themusing mainly infrared line fluxes combined with some optical line fluxes fromthe literature. Due to the high extinction toward the Bulge, the infraredspectra allow us to determine abundances for certain elements more accuratelythat previously possible with optical data alone. Abundances of argon andsulfur (and in most cases neon and oxygen) in planetary nebulae in the Bulgegive the abundances of the interstellar medium at the time their progenitorstars formed; thus these abundances give information about the formation andevolution of the Bulge. The abundances of Bulge planetary nebulae tend to beslightly higher than those in the Disk on average, but they do not follow thetrend of the Disk planetary nebulae, thus confirming the difference betweenBulge and Disk evolution. Additionally, the Bulge planetary nebulae showpeculiar dust properties compared to the Disk nebulae. Oxygen-rich dust feature(crystalline silicates) dominate the spectra of all of the Bulge planetarynebulae; such features are more scarce in Disk nebulae. Additionally,carbon-rich dust features (polycyclic aromatic hydrocarbons) appear in roughlyhalf of the Bulge planetary nebulae in our sample, which is interesting inlight of the fact that this dual chemistry is comparatively rare in the MilkyWay as a whole.

Chemical Abundances and Dust in Planetary Nebulae in the Galactic Bulge