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Paper: The s-Process Elemental Distribution in an s-Enhanced Extremely Metal-Poor Binary
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 51
Authors: Peterson, R. C.
Abstract: The abundances of s-process elements in the extremely metal-poor binary HE 0336+0113 are derived by calculating synthetic spectra for each of its components, co-adding them with a velocity offset of 15 km s-1, and comparing to the observed Keck HIRES spectrum. The two components, both unevolved, are found to have the same abundances. Their iron-to-hydrogen ratio is 1/200 solar, [Fe/H] = –2.3. Carbon and heavy s-process elements are enhanced to solar levels; nitrogen, sodium, and the light s-process elements are enhanced by more than a factor of ten, but magnesium has the normal factor-of-three halo enhancement. This further constrains main s-process element nucleosynthesis at low metallicity, as it occurred in the now-invisible third companion (a more massive, evolved star) while on the asymptotic giant branch.
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