From binaries to multiples II: hierarchical multiplicity of F and G dwarfs

Understand

Statistics of hierarchical multiplicity among solar-type dwarfs are studied using the distance-limited sample of 4847 targets presented in the accompanying Paper I.

• Known facts about binaries (multiplicity fraction 0.46, log-normal period distribution with median period 100yr and logarithmic dispersion 2.4, and nearly uniform mass-ratio distribution independent of the period) are confirmed with a high statistical significance.
• The fraction of hierarchies with three or more components is 0.13+-0.01, the fractions of targets with n=1,2,3,...
• components are 54:33:8:4:1.