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Fig. 12.

image

C/H surface abundance vs. orbital velocity for primary stars in our MESA binary models. The values were computed at a temperature of Teff = 12 500 K (see Table 1). The blue and green points represent stars moving towards the red and towards the blue in the HR diagram respectively. Not all of the stars moving towards the blue are considered BSGs by our criteria, due to low hydrogen surface abundances.

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