The R-process alliance

• Verfasst von: Xylakis-Dornbusch, Theodora [VerfasserIn]
• Verfasst von: Hansen, T. T. [VerfasserIn]
• Verfasst von: Beers, T. C. [VerfasserIn]
• Verfasst von: Christlieb, Norbert [VerfasserIn]
• Verfasst von: Ezzeddine, R. [VerfasserIn]
• Verfasst von: Frebel, A. [VerfasserIn]
• Verfasst von: Holmbeck, E. [VerfasserIn]
• Verfasst von: Placco, V. M. [VerfasserIn]
• Verfasst von: Roederer, I. U. [VerfasserIn]
• Verfasst von: Sakari, C. M. [VerfasserIn]
• Verfasst von: Sneden, C. [VerfasserIn]
• Titel: The R-process alliance
• Titelzusatz: analysis of limited-r stars
• Verf.angabe: T. Xylakis-Dornbusch, T.T. Hansen, T.C. Beers, N. Christlieb, R. Ezzeddine, A. Frebel, E. Holmbeck, V.M. Placco, I.U. Roederer, C.M. Sakari, and C. Sneden
• E-Jahr: 2024
• Jahr: August 2024
• Umfang: 13 S.
• Illustrationen: Illustrationen
• Fussnoten: Online veröffentlicht: 13. August 2024 ; Gesehen am 07.11.2024
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2024
• Band/Heft Quelle: 688(2024) vom: Aug., Artikel-ID A123, Seite 1-13
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/202449376
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1907884904

Abstract

Context. In recent years, the R-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 light r-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 (XLa) 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 the XLa of limited-r stars is lower than that of the kilonova AT2017gfo. The latter seems to be in the transition zone between limited-rXLa and that of r-I and r-II stars. Finally, we found that unlike r-I and r-II stars, the current sample of limited-r stars is largely born in the Galaxy and is not accreted.