De Silva, G. M.G. M.De SilvaCarraro, G.G.CarraroD'ORAZI, VALENTINAVALENTINAD'ORAZIEfremova, VVEfremovaMacpherson, H.H.MacphersonMartell, S.S.MartellRizzo, L.L.Rizzo2020-07-172020-07-1720150035-8711http://hdl.handle.net/20.500.12386/26488We thank the anonymous referee for helpful suggestions which have improved the paper. GC acknowledges financial support from the AAO Distinguished Visitor programme and ESO DGDF programme during a visit at AAO where part of this work was done. Based on observations obtained at the Anglo-Australian Telescope, Siding Spring Observatory, Australia. We thank the Centre de Données Astronomiques de Strasbourg (CDS), the US Naval Observatory and NASA for the use of their electronic facilities, especially SIMBAD, ViZier and ADS. This paper has made extensive use of the Webda data base at http://www.univie.ac.at/webda .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 ̃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 ± 2.25 km s<SUP>-1</SUP> for NGC 5617 and -38.46 ± 2.08 km s<SUP>-1</SUP> 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. Together with common motions and ages we confirm that NGC 5617 and Trumpler 22 are a primordial binary cluster pair in the Milky Way.STAMPAenArticle10.1093/mnras/stv15832-s2.0-84942771347000366215500010https://academic.oup.com/mnras/article/453/1/106/17490072015MNRAS.453..106DFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems