Statistical Analysis of a Comprehensive List of Visual Binaries

Kovaleva, D. A.; Malkov, O. Yu.; Yungelson, L. R.; Chulkov, Dmitry; Yikdem, G. M.

doi:10.1515/astro-2017-0238

Cited by 4 publications

(7 citation statements)

References 14 publications

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“…Of these, 175 are included in WDS only. The remaining 395 systems are included in more than one catalogue and, consequently, their components need cross-matching (the systems themselves were cross-matched by Isaeva et al 2015 and analyzed in Kovaleva et al 2015a).…”

Section: Very High Multiplicity Systems: Procedure Results and Discmentioning

confidence: 99%

On Utmost Multiplicity of Hierarchical Stellar Systems

et al. 2016

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Abstract. According to theoretical considerations, multiplicity of hierarchical stellar systems can reach, depending on masses and orbital parameters, several hundred, while observational data confirm the existence of at most septuple (seven-component) systems. In this study, we cross-match the stellar systems of very high multiplicity (six and more components) in modern catalogues of visual double and multiple stars to find among them the candidates to hierarchical systems. After cross-matching the catalogues of closer binaries (eclipsing, spectroscopic, etc.), some of their components were found to be binary/multiple themselves, what increases the system's degree of multiplicity. Optical pairs, known from literature or filtered by the authors, were flagged and excluded from the statistics. We compiled a list of hierarchical systems with potentially very high multiplicity that contains ten objects. Their multiplicity does not exceed 12, and we discuss a number of ways to explain the lack of extremely high multiplicity systems.

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Section: Very High Multiplicity Systems: Procedure Results and Discmentioning

confidence: 99%

On Utmost Multiplicity of Hierarchical Stellar Systems

et al. 2016

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“…After refining our dataset by removing erroneous data of various kinds, optical pairs, rounded-up data, multiples, etc. (see discussion in Kovaleva et al 2015b), some 47500 pairs having two and more different valid observations of relative positions of the components at different epochs remained. For more than 8000 of them, three or more observations are available.…”

Section: Distribution Of Wide Binaries Over Periodmentioning

confidence: 99%

“…The refined WCT dataset does not include pairs with degenerate or other peculiar-type components. For other stars, since mainly only the spectral type of the primary or combined spectrum is known, we consider this available spectral type as that of the primary and expect that the secondary has the same or fainter luminosity class (Kovaleva et al 2015b).…”

Section: Verification Of the Spectral Classificationmentioning

confidence: 99%

“…The WCT catalogue (together with WDS, CCDM and TDSC) was uploaded into the Binary stars database, BDB (Kaygorodov et al 2012, Kovaleva et al 2015a. A statistical investigation of the WCT data was described by Kovaleva et al (2015b). In this paper, we present solution of some problems we encountered, as well as add and analyze data to complete construction of the set of data for modelling.…”

Section: Introductionmentioning

confidence: 99%

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Visual Binary Stars: Data to Investigate Formation of Binaries

et al. 2016

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Statistics of orbital parameters of binary stars as well as statistics of their physical characteristics bear traces of star formation history. However, statistical investigations of binaries are complicated by lacking or incomplete observational data and by a number of observational selection effects.Visual binaries are the most numerous observed binaries, the number of pairs exceeds 130000. The most complete list of presently known visual binary stars was compiled by cross-matching objects and combining data of the three largest catalogues of visual binaries. It was supplemented by the data on parallaxes, multicolor photometry, spectral characteristics of the stars of this list taken from other catalogues. This allowed us to compensate partly for the lack of observational data for these objects. Combined data allowed us to check validity of observational values and to investigate statistics of the orbital and physical parameters of visual binaries. Corrections for incompleteness of observational data are discussed. Obtained datasets and modern distributions of binary parameters will be used to reconstruct the initial distributions and parameters of the function of star formation for binary systems.

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“…eclipsing, visual, spectroscopic, etc.). Observational types are determined by observational techniques used to register stellar duplicity, but overlap in the spaces of physical and observational parameters (Kovaleva 2015). Usually catalogues and databases address one or few selected observational types.…”

Section: Introductionmentioning

confidence: 99%