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The star HE 1305-0007 is a metal-poor double-enhanced star with metallicity[Fe/H] $=-2.0$, which is just at the upper limit of the metallicity for theobserved double-enhanced stars. Using a parametric model, we find that almostall s-elements were made in a single neutron exposure. This star should be amember of a post-common-envelope binary. After the s-process material hasexperienced only one neutron exposure in the nucleosynthesis region and isdredged-up to its envelope, the AGB evolution is terminated by the onset ofcommon-envelope evolution. Based on the high radial-velocity of HE 1305-0007,we speculate that the star could be a runaway star from a binary system, inwhich the AIC event has occurred and produced the r-process elements.

Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm