Distant components in double and multiple stars
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A discussion is presented of the IDS, LDS, and Gliese's catalogues, inasmuch as they are relevant to the multiplicity of field stars and the distribution of separations of the companions in binaries and triples.
The effect of dissociation of binaries with time is exhibited for a ‘quasi-unbiased’ sample of 106 nearby binaries taken from Gliese's catalogue. There are no binaries as old or older than the Sun with separations larger than 4000 AU, while binaries younger than the Sun may have separations as large as 180000 AU. The rate of this disruption seems too large to be produced by field stars; probably molecular clouds and spiral arms are the most effective agents.
It appears that the size of the inner commet cloud cannot be much larger than 2000–4000 AU.
KeywordsMolecular Cloud Young Star Close Companion Apparent Magnitude Double Star
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