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Title:
The frequency of low-mass companions to K and M stars in the solar neighbourhood
Authors:
Tokovinin, A. A.
Affiliation:
AA(State Astronomical Inst., Moscow, Russia)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 121-132. (A&A Homepage)
Publication Date:
03/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BINARY STARS, COMPANION STARS, K STARS, M STARS, RADIAL VELOCITY, SOLAR NEIGHBORHOOD, DWARF STARS, STELLAR MASS, STELLAR SPECTRA
Bibliographic Code:
1992A&A...256..121T

Abstract

The measurements of radial velocities of 200 stars from the Gliese catalog during 5 years with an accuracy of 0.5 km/s indicate the absence of substellar mass companions with periods less than 3000 d. The probability of companion detection is determined by numerical modeling. New data on spectroscopic orbits of late-type dwarfs are used to estimate the distribution of companion masses by the maximum likelihood method. The statistical properties of low-mass binaries are different from those of more massive main-sequence and giant systems: the frequency of spectroscopic binaries is less (10 +/- 2 percent) while at least half of them have a mass ratio exceeding 0.5. Evidence is found for a nonmonotonic distribution of the masses of secondary components with a deficit in the 0.2-0.3 solar mass range.

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