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The chemical abundances of neon and sulfur for 25 planetary nebulae (PNe) inthe Magellanic Clouds are presented. These abundances have been derived usingmainly infrared data from the Spitzer Space Telescope. The implications for thechemical evolution of these elements are discussed. A comparison with similarlyobtained abundances of Galactic PNe and HII regions and Magellanic Clouds HIIregions is also given. The average neon abundances are 6.0x10(-5) and2.7x10(-5) for the PNe in the Large and Small Magellanic Clouds respectively.These are ~1/3 and 1/6 of the average abundances of Galactic planetary nebulaeto which we compare. The average sulfur abundances for the LMC and SMC arerespectively 2.7x10(-6) and 1.0x10(-6). The Ne/S ratio (23.5) is on averagehigher than the ratio found in Galactic PNe (16) but the range of values inboth data sets is similar for most of the objects. The neon abundances found inPNe and HII regions agree with each other. It is possible that a few (3-4) ofthe PNe in the sample have experienced some neon enrichment, but for two ofthese objects the high Ne/S ratio can be explained by their very low sulfurabundances. The neon and sulfur abundances derived in this paper are alsocompared to previously published abundances using optical data andphoto-ionization models.

Neon and Sulfur Abundances of Planetary Nebulae in the Magellanic Clouds