Zobrazeno 1 - 10
of 32 065
pro vyhledávání: '"abundance patterns"'
Autor:
Griffith, Emily J., Hogg, David W., Hasselquist, Sten, Johnson, James W., Price-Whelan, Adrian, Sit, Tawny, Stone-Martinez, Alexander, Weinberg, David H.
Many nucleosynthetic channels create the elements, but two-parameter models characterized by $\alpha$ and Fe nonetheless predict stellar abundances in the Galactic disk to accuracies of 0.02 to 0.05 dex for most measured elements, near the level of c
Externí odkaz:
http://arxiv.org/abs/2410.22121
Autor:
Moehler, Sabine
Context: The metal-rich bulge globular cluster NGC6388 shows a blue horizontal branch (HB). Helium (He) enrichment, which is correlated with changes in other light elements, might explain this feature. The hot HB stars in the metal-poor globular clus
Externí odkaz:
http://arxiv.org/abs/2412.01432
Galaxies are not in a dynamical steady state. They continually undergo perturbations, e.g., from infalling dwarf galaxies and dark-matter substructure. After a dynamical perturbation, stars phase mix towards a new steady state; in so doing they gener
Externí odkaz:
http://arxiv.org/abs/2407.07149
Akademický článek
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The elemental abundances between strontium and silver ($Z = 38-47$) observed in the atmospheres of very metal-poor stars (VMP) in the Galaxy may contain the fingerprint of the weak $r$-process and $\nu p$-process occurring in early core-collapse supe
Externí odkaz:
http://arxiv.org/abs/2312.12306
Autor:
Roederer, Ian U., Vassh, Nicole, Holmbeck, Erika M., Mumpower, Matthew R., Surman, Rebecca, Cowan, John J., Beers, Timothy C., Ezzeddine, Rana, Frebel, Anna, Hansen, Terese T., Placco, Vinicius M., Sakari, Charli M.
Publikováno v:
Science, 382, 1177-1180 (2023)
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and
Externí odkaz:
http://arxiv.org/abs/2312.06844
Akademický článek
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Autor:
Vieira, Nicholas, Ruan, John J., Haggard, Daryl, Ford, Nicole M., Drout, Maria R., Fernández, Rodrigo
In kilonovae, freshly-synthesized $r$-process elements imprint features on optical spectra, as observed in AT2017gfo, the counterpart to the GW170817 binary neutron star merger. However, measuring the $r$-process compositions of the merger ejecta is
Externí odkaz:
http://arxiv.org/abs/2308.16796
Inferring microbial interaction networks from abundance patterns is an important approach to advance our understanding of microbial communities in general and the human microbiome in particular. Here we suggest discriminating two levels of informatio
Externí odkaz:
http://arxiv.org/abs/2306.02100