The R -Process Alliance: First Magellan/MIKE Release from the Southern Search for R -process-enhanced Stars
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Context. In recent years, theR -Process Alliance (RPA) has conducted a successful search for stars that are enhanced in elements produced by the rapid neutron-capture (r -)process. In particular, the RPA has uncovered a number of stars that are strongly enriched in lightr -process elements, such as Sr, Y, and Zr. These so-called limited-r stars were investigated to explore the astrophysical production site(s) of these elements.Aims. We investigate the possible formation sites for light neutron-capture elements by deriving detailed abundances for neutron-capture elements from high-resolution spectra with a high signal-to-noise ratio of three limited-r stars.Methods. We conducted a kinematic analysis and a 1D local thermodynamic equilibrium spectroscopic abundance analysis of three stars. Furthermore, we calculated the lanthanide mass fraction (X La) of our stars and of limited-r stars from the literature.Results. We found that the abundance pattern of neutron-capture elements of limited-r stars behaves differently depending on their [Ba/Eu] ratios, and we suggest that this should be taken into account in future investigations of their abundances. Furthermore, we found that theX Laof limited-r stars is lower than that of the kilonova AT2017gfo. The latter seems to be in the transition zone between limited-rX Laand that ofr -I andr -II stars. Finally, we found that unliker -I andr -II stars, the current sample of limited-r stars is largely born in the Galaxy and is not accreted.
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Accepted Manuscript1.0
- Journal Article:
- https://doi.org/10.3847/1538-4357/ab9d1a
