| |  Online-Ressource |
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| Verfasst von: | Ji, Alexander [VerfasserIn]  |
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| | Simon, Joshua D. [VerfasserIn] |
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| | Roederer, Ian U. [VerfasserIn] |
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| | Magg, Ekaterina [VerfasserIn] |
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| | Frebel, Anna [VerfasserIn] |
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| | Johnson, Christian I. [VerfasserIn] |
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| | Klessen, Ralf S. [VerfasserIn] |
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| | Magg, Mattis [VerfasserIn] |
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| | Cescutti, Gabriele [VerfasserIn] |
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| | Mateo, Mario [VerfasserIn] |
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| | Bergemann, Maria [VerfasserIn] |
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| | Bailey, John I. [VerfasserIn] |
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| Titel: | Metal mixing in the r-process enhanced ultrafaint dwarf galaxy reticulum II |
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| Verf.angabe: | Alexander P. Ji, Joshua D. Simon, Ian U. Roederer, Ekaterina Magg, Anna Frebel, Christian I. Johnson, Ralf S. Klessen, Mattis Magg, Gabriele Cescutti, Mario Mateo, Maria Bergemann, and John I. Bailey III |
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| E-Jahr: | 2023 |
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| Jahr: | 2023 February 13 |
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| Umfang: | 28 S. |
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| Fussnoten: | Gesehen am 05.04.2023 |
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| Titel Quelle: | Enthalten in: The astronomical journal |
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| Ort Quelle: | Washington, DC : AAS Publishing, American Astronomical Society, 1998 |
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| Jahr Quelle: | 2023 |
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| Band/Heft Quelle: | 165(2023), 3, Artikel-ID 100, Seite 1-28 |
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| ISSN Quelle: | 1538-3881 |
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| Abstract: | The ultrafaint dwarf galaxy Reticulum II was enriched by a single rare and prolific r-process event. The r-process content of Reticulum II thus provides a unique opportunity to study metal mixing in a relic first galaxy. Using multi-object high-resolution spectroscopy with VLT/GIRAFFE and Magellan/M2FS, we identify 32 clear spectroscopic member stars and measure abundances of Mg, Ca, Fe, and Ba where possible. We find of the stars are r-process-enhanced, with a mean and unresolved intrinsic dispersion σ [Ba/H]<0.20. The homogeneous r-process abundances imply that Ret II’s metals are well mixed by the time the r-enhanced stars form, which simulations have shown requires at least 100 Myr of metal mixing in between bursts of star formation to homogenize. This is the first direct evidence of bursty star formation in an ultrafaint dwarf galaxy. The homogeneous dilution prefers a prompt and high-yield r-process site, such as collapsar disk winds or prompt neutron star mergers. We also find evidence from [Ba/H] and [Mg/Ca] that the r-enhanced stars in Ret II formed in the absence of substantial pristine gas accretion, perhaps indicating that ≈70% of Ret II stars formed after reionization. |
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| DOI: | doi:10.3847/1538-3881/acad84 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext: https://doi.org/10.3847/1538-3881/acad84 |
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| | Volltext: https://iopscience.iop.org/article/10.3847/1538-3881/acad84 |
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| | DOI: https://doi.org/10.3847/1538-3881/acad84 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1841395293 |
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| Verknüpfungen: | → Zeitschrift |
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Metal mixing in the r-process enhanced ultrafaint dwarf galaxy reticulum II / Ji, Alexander [VerfasserIn]; 2023 February 13 (Online-Ressource)
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