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The R-Process Allia...
The R-Process Alliance : Abundance Universality among Some Elements at and between the First and Second R-Process Peaks
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Roederer, Ian U. (författare)
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Cowan, John J. (författare)
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Pignatari, Marco (författare)
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Beers, Timothy C. (författare)
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Den Hartog, Elizabeth A. (författare)
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Ezzeddine, Rana (författare)
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Frebel, Anna (författare)
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- Hansen, Terese T (författare)
- Stockholms universitet,Institutionen för astronomi
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Holmbeck, Erika M. (författare)
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Mumpower, Matthew R. (författare)
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Placco, Vinicius M. (författare)
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Sakari, Charli M. (författare)
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Surman, Rebecca (författare)
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Vassh, Nicole (författare)
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(creator_code:org_t)
- 2022-09-01
- 2022
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 936:1
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ∼ 80) and second (A ∼ 130) peaks. Our analysis is based on archival ultraviolet and optical spectroscopy of eight metal-poor stars with Se (Z = 34) or Te (Z = 52) detections, whose r-process enhancement varies by more than a factor of 30 (−0.22 ≤ [Eu/Fe] ≤ +1.32). We calculate ratios among the abundances of Se, Sr through Mo (38 ≤ Z ≤ 42), and Te. These benchmarks may offer a new empirical alternative to the predicted solar system r-process residual pattern. The Te abundances in these stars correlate more closely with the lighter r-process elements than the heavier ones, contradicting and superseding previous findings. The small star-to-star dispersion among the abundances of Se, Sr, Y, Zr, Nb, Mo, and Te (≤0.13 dex, or 26%) matches that observed among the abundances of the lanthanides and third r-process-peak elements. The concept of r-process universality that is recognized among the lanthanide and third-peak elements in r-process-enhanced stars may also apply to Se, Sr, Y, Zr, Nb, Mo, and Te, provided the overall abundances of the lighter r-process elements are scaled independently of the heavier ones. The abundance behavior of the elements Ru through Sn (44 ≤ Z ≤ 50) requires further study. Our results suggest that at least one relatively common source in the early Universe produced a consistent abundance pattern among some elements spanning the first and second r-process peaks.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Nucleosynthesis
- R-process
- Stellar abundances
- Ultraviolet astronomy
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Till lärosätets databas
- Av författaren/redakt...
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Roederer, Ian U.
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Cowan, John J.
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Pignatari, Marco
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Beers, Timothy C ...
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Den Hartog, Eliz ...
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Ezzeddine, Rana
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visa fler...
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Frebel, Anna
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Hansen, Terese T
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Holmbeck, Erika ...
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Mumpower, Matthe ...
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Placco, Vinicius ...
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Sakari, Charli M ...
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Surman, Rebecca
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Vassh, Nicole
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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Astrophysical Jo ...
- Av lärosätet
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Stockholms universitet