English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present new observational benchmarks of rapid neutron-capture process(r-process) nucleosynthesis for elements at and between the first (A ~ 80) andsecond (A ~ 130) peaks. Our analysis is based on archival ultraviolet andoptical 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, Srthrough Mo (38 <= Z <= 42), and Te. These benchmarks may offer a new empiricalalternative to the predicted solar system r-process residual pattern. The Teabundances in these stars correlate more closely with the lighter r-processelements than the heavier ones, contradicting and superseding previousfindings. 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 theabundances of the lanthanides and third r-process-peak elements. The concept ofr-process universality that is recognized among the lanthanide and third-peakelements 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 arescaled independently of the heavier ones. The abundance behavior of theelements Ru through Sn (44 <= Z <= 50) requires further study. Our resultssuggest that at least one relatively common source in the early Universeproduced a consistent abundance pattern among some elements spanning the firstand second r-process peaks.

The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks