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Abstract
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Results of abundance analyses of 14 Cepheids and nonvariable supergiants in the Magellanic Clouds are presented along with comparison data on four Galactic objects. Elemental abundances derived include Li, C, N, O, the alpha-elements, the Fe peak, and limited data on the heavy elements. Only HV 5497 in the LMC shows any detectable Li among the Cloud objects. The present CNO data, when combined with previous results, suggest a disparity between the LMC and the SMC supergiants in that the SMC stars have an essentially constant O/Fe ratio, while the LMC stars do not. The O/Fe ratios within both Clouds are lower than the ratio found in Galactic stars of similar metallicity, but are comparable to the O/Fe ratios found in Galactic supergiants. For heavier elements, previous results which indicate the light s- and r-process elements (Sr, Y, Zr) show Galactic ratios with respect to Fe, but that the heavy s- and r-process elements (Ba-Sm) are enhanced in the Clouds, are confirmed. |
