Stringent upper limit on Be star fractions produced by binary interaction

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Fig. 4.

Comparison of theory and observations. Be fraction as a function of fractional main-sequence turn-off mass in NGC 330 and NGC 2164, as shown in Fig. 3. Dashed lines show the theoretical upper limit given by Eq. (30) with α = −1.9, ΔM/M_2, i = 0, and κ = −1.0, 0 (see Fig. 1), as given by the legend.

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