Catalogue of wide binary, trinary and quaternary candidates from the Gaia data release 2 (region $\left|b\right|>25°$)

Abstract

The occurrence of multiple stars, dominantly binaries, is studied using the \textit{Gaia}-ESA DR2 catalogue. We apply the optimized statistical method that we previously developed for the analysis of 2D patterns. The field of stars is divided into a mosaic of small pieces, which represent a statistical set for analysis. Specifically, data input is represented by a grid of circles (events) with radius $0.02°$ covering the sky in the field of galactic latitude $\left|b\right|>25°$. The criteria for selecting candidates for multiple stars are based on two parameters: angular separation and collinearity of proper motion. Radial separation, due to limited accuracy, is used only as a weaker supplementary constraint. Due attention is paid to the accurate calculation of the background, which is a necessary input for evaluating the quality of the candidates. Our selection algorithm generates the catalogue of candidates: $900,842$ binaries, $5,282$ trinaries and $30$ quaternaries.

The second and extended version (20 pages, 21 figures, 6 tables) is accepted by the Astronomical Journal

References in corpus (4)

• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• A catalog of wide binary and multiple systems of bright stars from Gaia-DR2 and the Virtual Observatory
• Binary Star Population with Common Proper Motion in Gaia DR2
• Wide binaries in Planetary Nebulae with Gaia DR2

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