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We present the first measure of Fe and Na abundances in NGC 6362, a low-massglobular cluster where first and second generation stars are fully spatiallymixed. A total of 160 member stars (along the red giant branch and the redhorizontal branch) have been observed with the multi-object spectrograph FLAMESat the Very Large Telescope. We find that the cluster has an iron abundance of[Fe/H]=--1.09$\pm$0.01 dex, without evidence of intrinsic dispersion. On theother hand, the [Na/Fe] distribution turns out to be intrinsically broad andbimodal. The Na-poor and Na-rich stars populate, respectively, the bluest andthe reddest red giant branches detected in the color-magnitude diagramsincluding the U filter. The red giant branch is composed of a mixture of firstand second generation stars in a similar proportion, while almost all the redhorizontal branch stars belong to the first cluster generation. Until now, NGC6362 is the least massive globular cluster where both the photometric andspectroscopic signatures of multiple populations have been detected.

NGC6362: the least massive globular cluster with chemically distinct multiple populations