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Objects of the Catalog of Orbits of Visual Binary Stars in Gaia DR2
Chulkov, D. A.
Cross-identification is made for the Catalog of Orbits of Visual Binary Stars and Gaia DR2. At least one component has been matched for 88% systems, for 15% identification is available for both stars. Systems with substantially different parallaxes of components are found, which are the candidates to be the optical pairs. It's shown that published…
Distribution of visual binary stars over masses and separation between components
Tutukov, A. V.; Kovaleva, D. A.
We investigate initial ditributions of visual binary stars over semimajor axes of orbits, initial masses of main components, and mass ratios of components using complete data on wide stellar pairs from WDS catalogue and results of astrometric space missions Gaia and Hipparcos.
Red supergiants in Galaxy and in galaxies
Kovaleva, D. A.
We use Gaia DR2 data to compare distribution of Milky Way red supergiants over absolute stellar magnitude M Ks with similar distributions produced by RSG's in other galaxies (M31, M33, LMC, SMC). In spite of their different metallicities, three galaxies: MW, M31 and SMC - provide similar distributions, while the RSG's from M33 and LMC are differen…
Angular resolution of HD, HIP and DM catalogues
Malkov, O. Yu.
We estimate angular resolution of HD, HIP and BD/CD/CpD catalogues and discuss problems of cross-identification of components of visual binary stars with these catalogues.
Catalogue of Visual Binaries in Gaia DR2
Kovaleva, D. A.; Sapozhnikov, S. A.; Malkov, O. Y.
We use Gaia DR2 data to construct a catalogue of visual binaries between 10 pc and 100 pc distance from the Sun. Based on data on positions and parallaxes, we have compiled a list of binary candidates containing all pairs of stars positioned within 1 parsec to one another. We have developed an algorithm involving the separation of sky into smaller…
Comparing photometric and trigonometric distance scales in the Galaxy with Gaia DR2
Kovaleva, D. A.; Piskunov, A. E.; Kharchenko, N. V.
The average trigonometric parallaxes, determined according to Gaia DR2 for 143 open clusters at distances up to 8.5 kpc, are compared with the distances to the same clusters, determined in the framework of the MWSC project by the method of isochrone fitting. It is shown that the agreement between the trigonometric and photometric distance scales f…