SIMBAD references

2019ApJ...887..187B - Astrophys. J., 887, 187-187 (2019/December-3)

New s-process mechanism in rapidly rotating massive population II stars.

BANERJEE P., HEGER A. and QIAN Y.-Z.

Abstract (from CDS):

We report a new mechanism for the s-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(α,n)16O during core He burning. Neutron capture can last up to ∼1013s (∼3 x 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 metal-poor (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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): S-process - Stellar nucleosynthesis - Population II stars - Massive stars - CEMP stars - Stellar rotation

Simbad objects: 4

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2021.05.09-04:50:48

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