Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..727t&link_type=abstract
Astronomy Letters, Volume 23, Issue 6, November 1997, pp.727-730; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 834
Astronomy and Astrophysics
Astronomy
23
Scientific paper
The frequency of systems of multiplicity 3 or higher among the spectroscopic binary stars, in which the primary component is a dwarf of mass between 0.5 and 1.5 solar masses, depends sensitively on the binary's orbital period: for periods shorter than 10 days, this frequency is no less than 40%, while for periods between 10 and 100 days, it is a factor of 2 or 3 lower. This result has been obtained by comparing the catalog of orbits of spectroscopic binaries with the catalog of multiple systems and is confirmed by samples of dwarfs in the solar neighborhood that have been studied most thoroughly. Our observations also show that the frequency of spectroscopic binaries with periods up to 100 days among the distant faint third components in well-known multiple systems is a factor of 2 or 3 higher than that among the field stars. It is suggested that the presence of distant components plays a major role in forming close pairs.
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