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Published April 1, 2015 | Published + Submitted
Journal Article Open

Compact Stellar Binary Assembly in the First Nuclear Star Clusters and r-process Synthesis in the Early Universe


Investigations of elemental abundances in the ancient and most metal deficient stars are extremely important because they serve as tests of variable nucleosynthesis pathways and can provide critical inferences of the type of stars that lived and died before them. The presence of r-process elements in a handful of carbon-enhanced metal-poor (CEMP-r) stars, which are assumed to be closely connected to the chemical yield from the first stars, is hard to reconcile with standard neutron star mergers. Here we show that the production rate of dynamically assembled compact binaries in high-z nuclear star clusters can attain a sufficient high value to be a potential viable source of heavy r-process material in CEMP-r stars. The predicted frequency of such events in the early Galaxy, much lower than the frequency of Type II supernovae but with significantly higher mass ejected per event, can naturally lead to a high level of scatter of Eu as observed in CEMP-r stars.

Additional Information

© 2015 American Astronomical Society. Received 2014 October 13; accepted 2015 March 16; published 2015 April 1. We thank S. Shen, R. Cooke, E. Kirby, C. Miller, M. Rees, and S. Rosswog for insightful discussions as well as the editor and referees for insightful suggestions. We acknowledge financial support from the Packard Foundation, NSF (AST0847563), UCMEXUS (CN-12-578), and the Einstein Fellowship (L.R.).

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Submitted - 1410.3467v2.pdf

Published - 2041-8205_802_2_L22.pdf


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August 22, 2023
August 22, 2023