Binary star DataBase BDB development: Structure, algorithms, and VO standards implementation

Kovaleva, D. A.; Kaygorodov, P. V.; Malkov, O. Yu.; Debray, B.; Oblak, E.

doi:10.1016/j.ascom.2015.02.007

Cited by 23 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter ones were drawn from the Catalogue of Eclipsing Variables, CEV, compiled by Malkov et al (2006) mainly from the General Catalogue of Variable Stars, GCVS (Samus et al 2013), upgraded by Avvakumova et al (2013), and uploaded into the Binary stars database, BDB (Kaygorodov et al 2012;Kovaleva et al 2015). The results of our simulations were tested against a CEV-based sample of 415 Algols with original classification and 1726 systems classified as Algols using the procedure suggested by and substantially modified by Avvakumova & Malkov (2014), altogether 2141 systems.…”

Section: Observational Datamentioning

confidence: 99%

Hidden Population of Algols

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. We present the results of Monte Carlo simulation aiming to estimate the frequency of semi-detached Algol-type binaries among the stars observed as single. When an account is taken of various detection biases (mostly due to inclination of orbits), the fraction of Algols among the Galactic disk stars appears to be 0.1-0.2%. However, this number should be regarded as a lower limit only, since there are still unaccounted-for selection effects and other types of photometrically unresolved binaries. Hidden binarity appears to be an important phenomenon that should be taken into account when considering stellar statistics and constructing the fundamental relations between stellar parameters.

show abstract

Section: Observational Datamentioning

confidence: 99%

Hidden Population of Algols

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the literatures, large cells of MCF material are connected to each other through narrower windows . The desorption branch in the BdB pore size distribution analysis of the adsorption and desorption branches provide information about the cell and window, respectively . For the m PW/MCF catalysts, the hysteresis loop slopes slowly and moves in the low P/P 0 direction, indicating that the pore size of the sample is reduced after the loading of the phosphotungstic acid.…”

Section: Resultsmentioning

confidence: 99%

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀

et al. 2019

View full text Add to dashboard Cite

One-pot three-component Mannich reaction was carried out at room temperature using mesocellular cellular foam (MCF) silica loaded H 3 PW 12 O 40 as catalyst. The H 3 PW 12 O 40 /MCF catalyst was prepared by the traditional impregnation method and confirmed by a series of characterizations such as nitrogen adsorption, X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results showed that the H 3 PW 12 O 40 /MCF catalyst with 50 wt% loading of H 3 PW 12 O 40 exhibited the highest catalytic activity for the Mannich reaction of benzaldehyde, aniline and acetophenone with the yield of 94% in 1.8 hours under the optimal condition. In addition, the H 3 PW 12 O 40 /MCF catalyst could be easily recycled and reused four times without significant decline of activity. This work provided an improved modification of the three-component Mannich reaction in terms of efficient activity, mild reaction conditions, clean reaction profiles and a simple workup procedure.

show abstract

“…In order to take this into account, we cross-matched our systems with the lists of closer binaries (orbital, interferometric, spectroscopic, eclipsing, X-ray systems, radio pulsars) using the Binary star database, BDB (Kaygorodov et al 2012;Kovaleva et al 2015b). Besides, an indication of hidden binarity can sometimes be found in WDS Notes (34 cases).…”

Section: Very High Multiplicity Systems: Procedure Results and Discmentioning

confidence: 99%

On Utmost Multiplicity of Hierarchical Stellar Systems

et al. 2016

View full text Add to dashboard Cite

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.

show abstract

Binary star DataBase BDB development: Structure, algorithms, and VO standards implementation

Cited by 23 publications

References 6 publications

Hidden Population of Algols

Hidden Population of Algols

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀

On Utmost Multiplicity of Hierarchical Stellar Systems

Contact Info

Product

Resources

About

Binary star DataBase BDB development: Structure, algorithms, and VO standards implementation

Cited by 23 publications

References 6 publications

Hidden Population of Algols

Hidden Population of Algols

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H3PW12O40

On Utmost Multiplicity of Hierarchical Stellar Systems

Contact Info

Product

Resources

About

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀