New s -process Mechanism in Rapidly Rotating Massive Population II Stars

Banerjee, Projjwal; Heger, Alexander; Qian, Yong-Zhong

doi:10.3847/1538-4357/ab517a

Title: New s -process Mechanism in Rapidly Rotating Massive Population II Stars

Journal Article · 18 December 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab517a · OSTI ID:1800664

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Shanghai Jiao Tong Univ. (China); Indian Inst. of Technology (IIT), Kerala (India); Shanghai Jiao Tong University, China
Tsung-Dao Lee Institute, Shanghai (China); Monash Univ., Melbourne, VIC (Australia)
Tsung-Dao Lee Institute, Shanghai (China); Univ. of Minnesota, Minneapolis, MN (United States)

We report a new mechanism for the s9-process in rotating massive metal-poor stars. Our models show that above a critical rotation speed, such stars evolve in a quasi-chemically homogeneous fashion, which gives rise to a prolific s-process. Rotation-induced mixing results in primary production of ¹³C, which subsequently makes neutrons via ¹³C(a,n)¹⁶O during core He burning. Neutron capture can last up to ~10¹³ s (~3 × 10⁵ yr) with the peak central neutron density ranging from ~10⁷ to 10⁸ cm^-3. Depending on the rotation speed and the mass loss rate, a strong s-process can occur with production of elements up to Bi for progenitors with initial metallicities of [Z] ~ < -1.5. This result suggests that rapidly rotating massive metal-poor stars are likely the first sites of the main s-process. We find that these stars can potentially explain the early onset of the s-process and some of the carbon-enhanced metalpoor (CEMP-s and CEMP-r/s) stars with strong enrichment attributed to the s-process or a mixture of the r-process and the s-process.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-87ER40328

OSTI ID:: 1800664

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 887; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: New s -process Mechanism in Rapidly Rotating Massive Population II Stars

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References (88)

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