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We report on a detailed abundance analysis of the strongly r-process enhancedgiant star, HE 2327-5642 ([Fe/H] = -2.78, [r/Fe] = +0.99). Determination ofstellar parameters and element abundances was based on analysis of high-qualityVLT/UVES spectra. The surface gravity was calculated from the NLTE ionizationbalance between Fe I and Fe II, and Ca I and Ca II. Accurate abundances for atotal of 40 elements and for 23 neutron-capture elements beyond Sr and up to Thwere determined. The heavy element abundance pattern of HE 2327-5642 is inexcellent agreement with those previously derived for other strongly r-processenhanced stars. Elements in the range from Ba to Hf match the scaled Solarr-process pattern very well. No firm conclusion can be drawn with respect to arelationship between the fisrt neutron-capture peak elements, Sr to Pd, in HE2327-5642 and the Solar r-process, due to the uncertainty of the latter. Aclear distinction in Sr/Eu abundance ratios was found between the halo starswith different europium enhancement. The strongly r-process enhanced starsreveal a low Sr/Eu abundance ratio at [Sr/Eu] = -0.92+-0.13, while the starswith 0 < [Eu/Fe] < 1 and [Eu/Fe] < 0 have 0.36 dex and 0.93 dex larger Sr/Euvalues, respectively. Radioactive dating for HE 2327-5642 with the observedthorium and rare-earth element abundance pairs results in an average age of13.3 Gyr, when based on the high-entropy wind calculations, and 5.9 Gyr, whenusing the Solar r-residuals. HE 2327-5642 is suspected to be radial-velocityvariable based on our high-resolution spectra, covering ~4.3 years.

The Hamburg/ESO R-process Enhanced Star survey (HERES). V. Detailed abundance analysis of the r-process enhanced star HE 2327-5642