Search for wide binaries in the Yale Bright Star Catalogue

Details Search for wide binaries in the Yale Bright Star Catalogue Search for wide binaries in the Yale Bright Star Catalogue

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..253w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 253-275. Research supported by Siemens Corp.

Statistics

Computation

9

Astronomical Catalogs, Binary Stars, Molecular Clouds, Solar Neighborhood, Algorithms, Computational Astrophysics

Scientific paper

The authors define specific criteria for identifying candidate wide binaries in the Yale Bright Star Catalogue. These criteria select all pairs of stars with projected angular separations of Δθ < θ0 and relative proper motions Δμ < μ0, where θ0 and μ0 are arbitrarily chosen cutoffs. The authors present a list of candidate pairs with θ0 = 10arcmin and μ0 =0arcsec.01 yr-1 and discuss the statistics of candidates with θ0 as large as 1°. To assess the significance of these indentifications, the authors compute the expected background due to random associations that would result if there were no actual pairwise correlations. For this purpose the Bahcall-Soneira Galaxy model is applied. The authors present evidence for clustering on relatively large scales that is unlikely to be due to binaries. Their results can be most plausibly ascribed to bound or currently dissolving open clusters with core radii ≡1 pc. Interpreting their candidate list as a superposition of wide binaries and coincident pairs of cluster members, the authors estimate that the number density of wide binaries nWB ⪉ 5% of the stellar density in the solar neighborhood.

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