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researcher

Sam A. Usman

8 papers hereh-index 342 citations9 works total

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

author position
  • first author2
  • middle author3
  • last author3

Across the 8 of 8 papers where every author was matched, so the position is known.

fields
  • astro-ph.GA6
  • astro-ph.SR2

identity via Semantic Scholar / OpenAlex

activity
20242026
collaborators
Showing astro-ph.SRShow all

2 papers · 1 filter

astro-ph.SR2026

The R-Process Alliance: Actinide Abundances, Variation, and Evolution in Metal-Poor Stars

Shivani P. Shah, Rana Ezzeddine, Erika M. Holmbeck +11

The actinides, including thorium (Th), are the heaviest observable elements synthesized in the universe, holding clues to the extremes of the astrophysical and nuclear conditions o…

astro-ph.SR2025

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams

Kaitlin B. Webber, Terese T. Hansen, Jennifer L. Marshall +20

We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/MIK…

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