Binarity at LOw Metallicity (BLOeM) - Enhanced multiplicity of early B-type dwarfs and giants at Z = 0.2 Z⊙

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Fig. 6.

Observed multiplicity fraction as a function of the cut-off value C. The 20 km s⁻¹ threshold used by previous studies (Sana et al. 2013; Bodensteiner et al. 2021; Banyard et al. 2022) is marked with the dashed line. The adoption of C = 20 km s⁻¹ yields the observed binary fraction of $f_{mult}^{obs} = 49.5 \pm 2.8 %$ $f^{\mathrm{obs}}_{\mathrm{mult}}={49.5}\pm{2.8}\%$ . At C = 0, the observed multiplicity fraction is purely given by Equation (1).

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