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We present near-IR spectroscopy of the massive intermediate age star clusterW3 in the merger remnant galaxy NGC 7252, obtained with the NTT telescope. Thiscluster has an age when the integrated near-IR properties of a stellarpopulation are dominated by the cool and luminous AGB stars. We compare thedata with instantaneous curst model predictions from new evolutionary synthesismodels that include: (1) the computation of the evolution through the TP-AGBfor low- and intermediate-massive stars, with the initial mass and metallicitydependent formation of carbon stars; (2) spectroscopic data from a new stellarlibrary in which differences betwenn static giants, vriable O-rich TPAGB starsand carbon stars are accounted for. The comparison of the data to the modelsclearly shows that carbon stars are present: for the first time, carbon starspectral features are thus detected directly outside the Local Group (abriged)Comment: Accepted for publication in A&A, 14 page

First spectroscopic evidence for carbon stars outside the local group: Properties of a massive star cluster in NGC 7252