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Statistical analysis of binary stars from the Gaia catalog data release 2

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    0534335 - FZÚ 2021 RIV US eng J - Journal Article
    Závada, Petr - Píška, Karel
    Statistical analysis of binary stars from the Gaia catalog data release 2.
    Astronomical Journal. Roč. 159, č. 1 (2020), s. 1-15, č. článku 33. ISSN 0004-6256
    Institutional support: RVO:68378271
    Keywords : star: binary * binary: mass * statistical * statistical analysis * dimension: 2 * dimension: 3 * orbit
    Subject RIV: BE - Theoretical Physics
    OBOR OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
    Impact factor: 5.840, year: 2019

    We have developed a general statistical procedure for analysis of 2D and 3D finite patterns, which is applied to the data from recently released Gaia-ESA catalog DR2. The 2D analysis clearly confirms our former results on the presence of binaries in the former DR1 catalog. Our main objective is the statistical 3D analysis of DR2. For this, it is essential that the DR2 catalog includes parallaxes and data on the proper motion. The analysis allows us to determine for each pair of stars the probability that it is the binary star. This probability is represented by the function depending on the separation. Furthermore, a combined analysis of the separation with proper motion provides a clear picture of binaries with two components of the motion: parallel and orbital. The result of this analysis is an estimate of the average orbital period and mass of the binary system. The catalog we have created involves 80,560 binary candidates.

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