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Fig. 17.


Critical periods below which one of the components fills its Roche lobe at either the tip of the RGB (PRGB, 1, dashed line at the bottom of the figure) or at the tip of the AGB (PAGB, 1, solid line at the top of the figure). The values RRGB, tip and RAGB, tip are computed from the STAREVOL outputs. Red curves have solar metallicity Z = 0.0134 and black curves have [Fe/H]= − 0.5 or Z = 0.0043. Various superimposed lines in a series correspond to various barium-star masses, MBa, which may be identified from the starting point of the curve. The critical period PRGB, 2 can be read off the PRGB, 1 curve at the corresponding MBa value, which determines the key value RRGB, tip. Although PRGB, 1 and PRGB, 2 are not strictly equal, they are not different enough to warrant a specific PRGB, 2 curve that would jeopardize the clarity of the figure.

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