  We have undertaken a comprehensive abundance analysis for a sample of
relatively unexplored RV Tauri and RV Tauri like stars to further our
understanding of post-Asymptotic Giant Branch (post-AGB) evolution. From our
study based on high resolution spectra and grid of model atmospheres, we find
indications of mild s-processing for V820 Cen and IRAS 06165+3158. On the other
hand, SU Gem and BT Lac exhibit the effects of mild dust-gas winnowing. We have
also compiled the existing abundance data on RV Tauri objects and find that a
large fraction of them are afflicted by dust-gas winnowing and now added by the
present work, we find a small group of two RV Tauris showing mild s-process
enhancement in our Galaxy. With two out of three reported s-process enhanced
objects belonging to RV Tauri spectroscopic class C, these intrinsically
metal-poor objects appear to be promising candidates to analyse the possible
s-processing in RV Tauri stars.
