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The Magellanic Clouds (MCs) offer a unique opportunity to study the stellarevolution and nucleosynthesis of massive Asymptotic Giant Branch (AGB) stars inlow metallicity environments where distances are known. Rubidium is a keyelement to distinguish between high mass AGB stars and low mass AGBs or othertype of astronomical objects such as massive red supergiant stars.Theoretically, high mass AGBs are predicted to produce a lot of Rb. We presentthe discovery of massive Rb-rich AGB stars in the MCs, confirming for the firsttime that these stars also exist in other galaxies. Our findings show thatthese stars are generally brighter than the standard adopted luminosity limit(Mbol ~ -7.1) for AGB stars. The observations of massive MC AGBs arequalitatively predicted by the present theoretical models. However, thesetheoretical models are far from matching the extremely high Rb overabundancesobserved. This might be related with an incomplete present understanding of theatmospheres of these stars.

Rubidium-rich Asymptotic Giant Branch stars in the Magellanic Clouds