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researcher

S. Ryan

25 papers hereh-index 467.5k citations176 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • sole author4
  • first author2
  • middle author11
  • last author6

Across the 23 of 25 papers where every author was matched, so the position is known.

fields
  • astro-ph24
  • astro-ph.SR1
same name
  • S. Ryan — 18 papers, h 19
  • S. Ryan — 1 paper, h 3

Either other researchers who publish under this name, or the same person where the external sources have not merged their records.

identity via Semantic Scholar / OpenAlex

activity
19982009
most citedNucleosynthetic signatures of the first stars

566 citations · 1.7k across the 12 of their papers we have counts for

collaborators
Showing 2003Show all

2 papers · 1 filter

astro-ph2003

Europium Isotope Ratios in s-Process-Element-Enhanced, Metal-Poor Stars: A New Probe of the 151Sm Branching

Wako Aoki, Sean G. Ryan, Nobuyuki Iwamoto +6

We report on the first measurement of the Eu isotope fractions (151Eu and 153Eu) in s-process-element-enhanced, metal-poor stars. We use these ratios to investigate the 151Sm branc…

astro-ph2003

Detection of low Eu abundances in extremely metal-poor stars and the origin of r-process elements

Yuhri Ishimaru, Shinya Wanajo, Wako Aoki +1

We report abundance analyses of three extremely metal-poor stars with [Fe/H] ≲−3, using the Subaru High Dispersion Spectrograph (HDS). All are found to have sub-solar val…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.