On the frequency of wide pairs among nearby dwarf stars

Details On the frequency of wide pairs among nearby dwarf stars On the frequency of wide pairs among nearby dwarf stars

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esasp.201..231u&link_type=abstract

In ESA Statist. Methods in Astron. p 231-232 (SEE N84-19196 09-89)

Astronomy and Astrophysics

Astronomy

4

Astronomical Models, Companion Stars, Dwarf Stars, Star Distribution, Data Sampling, K Stars, Predictions, Velocity Distribution

Scientific paper

The possibility that the predicted number of chance pairings occurring among random space velocities of any sample of stars is affected by their nonuniform density in velocity space was studied. The velocity space of 171 K and M dwarfs was divided into volume elements whose star counts were compared with those predicted by a Poisson distribution, to test for randomness. Results for late-type dwarfs strongly suggest that a single velocity ellipsoid forms a satisfactory model for their motions and that no statistical evidence for wide pairs or triples is evident. Wide pairs appear to be at best a rare phenomenon in all but the very young stars and at worst nonexistent.

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