2849 20160701171711.0 ASTROimport-1006 Gorlova, N. 2011 HERMES survey of binarity in evolved stars We report on our radial velocity monitoring project of a wide range of evolved stars where binarity was proposed to explain some of their peculiarities. Our spectrograph HERMES is a new optical echelle spectrograph mounted on the 1.2m Mercator telescope on La Palma, built by a consortium of Belgian Institutes (KULeuven, ULB, Royal Observatory) with contributions from the Geneva Observatory and Landessternwarte Tautenburg. By combining high S/N single observations with low S/N time-series, we aim at quantifying the orbital and chemical characteristics of every distinct subgroup. The final goal is to gain insight in the diverse binary interaction processes relevant at late stages of stellar evolution. We discuss our project, the unique capabilities of HERMES, and present the first results of our program. van Winckel, H. Jorissen, A. van Eck, S. Dermine, T. Exter, K. Østensen, R. H. van de Steene, G. Asymmetric Planetary Nebulae 5 Conference 2011 http://esoads.eso.org/abs/2011apn5.confE.246G published in NONREF