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We have used a sample of high-resolution spectra obtained with themulti-fiber facility FLAMES at the Very Large Telescope of the EuropeanSouthern Observatory, to derive the kinematical and chemical properties of thetwo young Large Magellanic Cloud globular clusters NGC 2136 and NGC 2137. Thesetwo clusters represent a typical example of LMC cluster pair suspected to bebound in a binary system: indeed the cluster centers of gravity have an angularseparation of less than 1.4 arcmin in the sky. The spectral analysis of sevengiants in NGC 2136 and four in NGC 2137 reveals that the two clusters sharevery similar systemic radial velocities, namely Vrad=271.5\pm0.4 km/s(sigma=1.0 km/s) and Vrad=270.6\pm0.5 km/s (sigma=0.9 km/s) for NGC 2136 andNGC 2137, respectively, and they have also indistinguishable abundancepatterns. The iron content is [Fe/H]=-0.40\pm0.01 dex (sigma=0.03 dex) for NGC2136 and -0.39\pm0.01 dex (sigma=0.01 dex) for NGC 2137, while the [alpha/Fe]ratios are roughly solar in both clusters. These findings suggest that the twoclusters are gravitationally bound and that they formed from the fragmentationof the same molecular cloud that was chemically homogeneous. This is the firstfirm confirmation of the binary nature of a LMC cluster pair. The most likelyfate of this system is to merge into a single structure in a time-scalecomparable with its orbital period.

Blood ties: the real nature of the LMC binary globular clusters NGC 2136 and NGC 2137