Fig. 2
a) Schematic regions in the parameter space of initial primary mass M1 and mass ratio q for the progenitors of EMP stars (M ≈ 0.8 M⊙, between the solid lines) and of CEMP and NEMP stars (light and dark shading, respectively); see text for details. b) Three examples of the initial primary mass function (Kroupa et al. 1993; Lucatello et al. 2005a; Komiya et al. 2007). c) Comparison of two initial mass-ratio distributions.
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