Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..121t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 121-132.
Astronomy and Astrophysics
Astrophysics
58
Binary Stars, Companion Stars, K Stars, M Stars, Radial Velocity, Solar Neighborhood, Dwarf Stars, Stellar Mass, Stellar Spectra
Scientific paper
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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