The Gaia-ESO survey: Placing constraints on the origin of r-process elements
| العنوان: | The Gaia-ESO survey: Placing constraints on the origin of r-process elements |
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| المؤلفون: | van der Swaelmen, M., Viscasillas Vazquez, C., Cescutti, G., Magrini, L., Cristallo, S., Vescovi, D., Randich, S., Tautvaisiene, G., Bagdonas, V., Bensby, T., Bergemann, M., Bragaglia, A., Drazdauskas, A., Jimenez-Esteban, F., Guiglion, G., Korn, Andreas, 1972, Masseron, T., Minkeviiute, R., Smiljanic, R., Spina, L., Stonkute, E., Zaggia, S. |
| المصدر: | Astronomy and Astrophysics. 670 |
| مصطلحات موضوعية: | Galaxy: abundances, Galaxy: disk, open clusters and associations: general, stars: abundances |
| الوصف: | Context: A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the r-process. However, the origin of the r-process elements at different metallicities is still under debate.Aims: We aim at investigate the origin of the r-process elements in the Galactic thin-disc population.Methods: From the sixth internal data release of the Gaia-ESO, we have collected a large sample of Milky Way (MW) thin- and thick-disc stars for which abundances of Eu, O, and Mg are available. The sample consists of members of 62 open clusters (OCs), located at a Galactocentric radius between similar to 5kpc and similar to 20kpc in the disc, in the metallicity range [- 0.5,0.4], and covering an age interval from 0.1 to 7 Gy, and about 1300 Milky Way disc field stars in the metallicity range [- 1.5,0.5]. We compare the observations with the results of a chemical evolution model, in which we varied the nucleosynthesis sources for the three elements considered.Results: Our main result is that Eu in the thin disc is predominantly produced by sources with short lifetimes, such as magneto-rotationally driven SNe. There is no strong evidence for additional sources at delayed times.Conclusions: Our findings do not imply that there cannot be a contribution from mergers of neutron stars in other environments, as in the halo or in dwarf spheroidal galaxies, but such a contribution is not needed to explain Eu abundances at thin-disc metallicities. |
| وصف الملف: | electronic |
| الوصول الحر: | https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-504201Test https://doi.org/10.1051/0004-6361/202243764Test https://uu.diva-portal.org/smash/get/diva2:1766177/FULLTEXT01.pdfTest |
| قاعدة البيانات: | SwePub |
| DOI: | 10.1051/0004-6361/202243764 |
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