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Abstract Preliminary results are given for a systematic survey of K-dwarf stars in the solar vicinity. Nine companions to the G and K dwarfs have very low M 2 sin i , less than 0.08 M ⊙ . These detections from a sample of 540 G and K primary stars support the reality of the existence of companions with mass below 0.08 M ⊙ : brown dwarfs exist. A comparison of the relative mass function distribution f(m)/M 1 between low-mass ( M 1 < 1.3 M ⊙ ) and intermediate-mass (2 < M 1 < 5 M ⊙ ) binaries suggests a dependence of the mass-ratio distribution on the mass of the primary: f ( q, M 1 ). By combining the photometric information with orbital elements constraints, we have derived the mass-ratio distribution for intermediate-mass stars. As is the case for low-mass stars, this distribution does not have any maximum close to M 2 / M 1 = 1.
Mayor et al. (Wed,) studied this question.
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