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Fig. 4

image

[Ba/Fe] vs. [Fe/H]. The star analysed here is shown using a blue star; the open small dots are data collected by Placco et al. (2014) and the arrows indicate upper limits; the big open dots are data from Hansen et al. (2015); the solid squares from Hansen et al. (2012); the open squares are taken from Hansen et al. (2016). The cyan symbols refer to carbon-enhanced metal-poor (CEMP) stars without s-process enhancement, adopting the criterion [C/Fe] > 0.7 for carbon enhancement, as in Placco et al. (2014); the black symbols are for normal stars. We do not plot stars with carbon and s-process enhancement (CEMP-s). The colour-coded surface density plot presents the density of long-living stars for the model of spinning faint SNe. The contour plot with the dashed line shows the results for the model of spinstars, the contour plot with the solid line shows the results for the model of faint SNe.

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