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Using photometry and high resolution spectroscopy we investigate for thefirst time the physical connection between the open clusters NGC 5617 andTrumpler 22. Based on new CCD photometry we report their spatial proximity andcommon age of ~70 Myr. Based on high resolution spectra collected using theHERMES and UCLES spectrographs on the Anglo-Australian telescope, we presentradial velocities and abundances for Fe, Na, Mg, Al, Si, Ca and Ni. Themeasured radial velocities are -38.63 +/-2.25 km/s for NGC 5617 and -38.46+/-2.08 km/s for Trumpler 22. The mean metallicity of NGC 5617 was found to be[Fe/H] =-0.18 +/-0.02 and for Trumpler 22 was found to be [Fe/H] = -0.17+/-0.04. The two clusters share similar abundances across the other elements,indicative of a common chemical enrichment history of these clusters. Togetherwith common motions and ages we confirm that NGC 5617 and Trumpler 22 are aprimordial binary cluster pair in the Milky Way.

Binary open clusters in the Milky Way: photometric and spectroscopic analysis of NGC 5617 and Trumpler 22