Cambridge University Press (CUP), Proceedings of the International Astronomical Union, S343(14), p. 89-92, 2018
DOI: 10.1017/s1743921318005100
Full text: Unavailable
AbstractUsing abundances from the available largest, homogeneous sample of high resolution Barium (Ba) star spectra we calculated the ratios of different hs-like to ls-like elemental ratios and compared to different AGB nucleosynthesis models. The Ba star data show an incontestable increase of the hs-type/ls-type element ratio (for example, [Ce/Y]) with decreasing metallicity. This trend in the Ba star observations is predicted by low mass, non-rotating AGB models where 13C is the main neutron source and is in agreement with Kepler asteroseismology observations.