Using photometry and high resolution spectroscopy we investigate for the first time the physical connection between the open clusters NGC 5617 and Trumpler 22 .
Based on new CCD photometry we report their spatial proximity and common age of \sim 70 Myr .
Based on high-resolution spectra collected using the HERMES and UCLES spectrographs on the Anglo-Australian telescope , we present radial velocities and abundances for Fe , Na , Mg , Al , Si , Ca , and Ni .
The measured radial velocities are -38.63 \pm 2.25 \mbox { kms } ^ { -1 } Â for NGC 5617 and -38.46 \pm 2.08 \mbox { kms } ^ { -1 } Â for Trumpler 22 .
The mean metallicity of NGC 5617 was found to be [ Fe/H ] = - 0.18 \pm 0.02 and for Trumpler 22 was found to be [ Fe/H ] = - 0.17 \pm 0.04 .
The two clusters share similar abundances across the other elements , indicative of a common chemical enrichment history of these clusters .
Together with common motions and ages we confirm that NGC 5617 and Trumpler 22 are a primordial binary cluster pair in the Milky Way .