Publication Abstracts

Clarkson et al. 2018

Clarkson, O., F. Herwig, and M. Pignatari, 2018: Pop III i-process nucleosynthesis and the elemental abundances of SMSS J0313-6708 and the most iron-poor stars. M. Not. Roy. Astron. Soc. Lett., 474, no. 1, L37-L41, doi:10.1093/mnrasl/slx190.

We have investigated a highly energetic H-ingestion event during shell He burning leading to H-burning luminosities of log(LH/L) ∼13 in a 45 M Pop III massive stellar model. In order to track the nucleosynthesis which may occur in such an event, we run a series of single-zone nucleosynthesis models for typical conditions found in the stellar evolution model. Such nucleosynthesis conditions may lead to i-process neutron densities of up to ∼1013 cm-3. The resulting simulation abundance pattern, where Mg comes from He burning and Ca from the i process, agrees with the general observed pattern of the most iron-poor star currently known, SMSS J031300.36-670839.3. However, Na is also efficiently produced in these i-process conditions, and the prediction exceeds observations by ∼2.5 dex. While this probably rules out this model for SMSS J031300.36-670839.3, the typical i-process signature of combined He burning and i process of higher than solar [Na/Mg], [Mg/Al], and low [Ca/Mg] is reproducing abundance features of the two next most iron-poor stars HE 1017-5240 and HE 1327-2326 very well. The i process does not reach Fe which would have to come from a low level of additional enrichment. i process in hyper-metal-poor or Pop III massive stars may be able to explain certain abundance patterns observed in some of the most metal-poor CEMP-no stars.

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BibTeX Citation

@article{cl03100n,
  author={Clarkson, O. and Herwig, F. and Pignatari, M.},
  title={Pop III i-process nucleosynthesis and the elemental abundances of SMSS J0313-6708 and the most iron-poor stars},
  year={2018},
  journal={M. Not. Roy. Astron. Soc. Lett.},
  volume={474},
  number={1},
  pages={L37--L41},
  doi={10.1093/mnrasl/slx190},
  isbn={1745-3925}
}

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RIS Citation

TY  - JOUR
ID  - cl03100n
AU  - Clarkson, O.
AU  - Herwig, F.
AU  - Pignatari, M.
PY  - 2018
TI  - Pop III i-process nucleosynthesis and the elemental abundances of SMSS J0313-6708 and the most iron-poor stars
JA  - M. Not. Roy. Astron. Soc. Lett.
VL  - 474
IS  - 1
SP  - L37
EP  - L41
DO  - 10.1093/mnrasl/slx190
SN  - 1745-3925
ER  -

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