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• W3103241331 abstract "The stellar record of elemental abundances in satellite galaxies is important to identify the origin of r-process because such a small stellar system could have hosted a single r-process event, which would distinguish member stars that are formed before and after the event through the evidence of a considerable difference in the abundances of r-process elements, as found in the ultra-faint dwarf galaxy Reticulum II (Ret II). However, the limited mass of these systems prevents us from collecting information from a sufficient number of stars in individual satellites. Hence, it remains unclear whether the discovery of a remarkable r-process enrichment event in Ret II explains the nature of r-process abundances or is an exception. We perform high-resolution spectroscopic measurements of r-process abundances for 12 metal-poor stars in the Draco dwarf galaxy in the metallicity range of . We found that these stars are separated into two groups with r-process abundances differing by one order of magnitude. A group of stars with high abundances of r-process elements was formed by a single r-process event that corresponds to the event evidenced in Ret II. On the other hand, the low r-process abundance group was formed by another sporadic enrichment channel producing far fewer r-process elements, which is clearly identified for the first time. Accordingly, we identified two populations of stars with different r-process abundances, which are built by two r-process events that enriched gases at levels that differ by more than one order of magnitude." @default.
• W3103241331 created "2020-11-23" @default.
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• W3103241331 date "2017-11-16" @default.
• W3103241331 modified "2023-10-16" @default.
• W3103241331 title "Enrichment in <i>r</i> -process Elements from Multiple Distinct Events in the Early Draco Dwarf Spheroidal Galaxy" @default.
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• W3103241331 doi "https://doi.org/10.3847/2041-8213/aa9886" @default.
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