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• W4307984966 abstract "Abstract We present an improved numerical method to model subsolar He+CO-WD merger progenitors of R Corona Borealis stars that builds on our previous work. These improvements include a smooth entropy transition from the core to the envelope of the post-merger, inclusion of single-zone nucleosynthesis to mimic the effects of burning during the merger event, and post-processing the models with a larger nuclear network for analysis of s -process nucleosynthesis. We perform a parameter study to understand the effects of the entropy transition, peak temperature, and overshooting on our models. The models that best agree with observations of R Corona Borealis stars are processed with a much larger nuclear network to investigate s -process nucleosynthesis and the dredge-up of s -process products into the outer envelope in detail. We present a model with a significant enhancement in s -process elements, which also agrees with observed surface abundances and isotopic ratios of 16 O/ 16 O and C/O between 1 and 10. Finally, we find that the neutron exposure and initial neutron densities this model requires to obtain such an enhancement are much more consistent with i -process nucleosynthesis." @default.
• W4307984966 created "2022-11-07" @default.
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• W4307984966 date "2022-11-01" @default.
• W4307984966 modified "2023-10-01" @default.
• W4307984966 title "Improved Models of R Coronae Borealis Stars" @default.
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• W4307984966 doi "https://doi.org/10.3847/1538-4357/ac9476" @default.
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