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Aims.The aim of this study is a detailed abundance analysis of the newlydiscovered r-rich star HE 1405 0822, which has [Fe=H]=-2.40. This star showsenhancements of both r- and s-elements, [Ba/Fe]= +1.95 and [Eu/Fe]=1.54, forwhich reason it is called r+s star. Methods.Stellar parameters and elementabundances were determined by analying high-quality VLT/UVES spectra. We usedFe I line excitation equilibria to derive the effective temperature. Thesurface gravity was calculated from the Fei/Feii and Ti I/Ti II equilibria.Results.We determined accurate abundances for 39 elements, including 19neutron-capture elements. HE 1405-0822 is a red giant. Its strong enhancementsof C, N, and s-elements are the consequence of enrichment by a former AGBcompanion with an initial mass of less than 3 M_Sun. The heavy n-captureelement abundances (including Eu, Yb, and Hf) seen in HE 1405-0822 do not agreewith the r-process pattern seen in strongly r-process-enhanced stars. Wediscuss possible enrichment scenarios for this star. The enhanced alphaelements can be explained as the result of enrichment by supernovae of type II.Na and Mg may have partly been synthesized in a former AGB companion, when theprimary 22^Ne acted as a neutron poison in the 13^C-pocket.

The Hamburg/ESO R-process Enhanced Star survey (HERES) VIII. The r+s star HE 1405 0822