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Research in Astronomy and Astrophysics 2020年第11期20卷 231-234页

作者： Ekaterina Shmaylova vladimir dyachenko Andrea Richichi Anatoly Beskakotov AleksandrMaksimov Arina Mitrofanova Yuri Balega Special Astrophysical Observatory Russian Academy of SciencesNizhniy ArkhyzKarachai-Cherkessian RepublicRussia 369167 Astronomical Institute St.Petersburg State UniversityUniversitetskij Pr.28Petrodvorets198504St.PetersburgRussia INAF-Osservatorio Astrofisico di Arcetri Largo E.Fermi 550125FirenzeItaly

Observations by the method of lunar occultations at the 6-m telescope of the SAO RAS reach a resolution limit better than 1mas.We have devised a new method of observation,which allows obtaining the curves of lunar occultations simultaneously in different ranges of the visible part of the spectrum,and conducted the first observations using amodified optical system.In January 2019,applying the newmethod,the magnitude differences of the components of the binary star HD 36524 in the R and I bands were measured,which were 1.5 and 1.3mag,respectively,in good agreement with values calculated from the Gaia mission.According to the obtained data,it was determined that with this method it is possible to reach a signal-to-noise ratio of about 5–10 for stars of 10th magnitude.We discuss the applicability of the proposed optical scheme for the study of binary stars.

关键词： star binaries general instrumentation high angular resolution methods observational

On the correctness of orbital solutions obtained from a small set of points.Orbit of HIP 53731

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Research in Astronomy and Astrophysics 2020年第11期20卷 321-324页

作者： Arina Mitrofanova vladimir dyachenko Anatoly Beskakotov Yury Balega Alexander Maksimov Denis Rastegaev Sergey Komarinsky Special Astrophysical Observatory of the Russian Academy of Sciences Nizhnij ArkhyzRussia 369167

HIP 53731 is a binary consisting of stars of the spectral types K0 and K9.The orbit of this object was constructed previously by Cvetkovic et al.and improved by Tokovinin.It should be noted that there is a 180°ambiguity in the position angles of some published measurements.Speckle interferometric observations were obtained in 2007–2020(21 measurements)at the 6-m telescope of the SAO RAS(BTA)by the authors of this article.The analysis of new data together with previously published ones made it possible to construct an accurate orbit of HIP 53731 and to halve the already known values of the orbital period of the system.As a result of the study,the mass sum,the masses of each component and their spectral types were determined by two independent methods.According to the qualitative classification of orbits,the orbital solution has grade 2–"good"(observations cover more than half of the orbital period and correspond to different phases).

关键词： techniques high angular resolution,speckle interferometry stars low-mass,fundamental parameters stars binaries spectroscopic stars individual HIP 53731

Research on the HIP 18856 binary system

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Research in Astronomy and Astrophysics 2021年第3期21卷 69-72页

作者： Polina Efremova Arina Mitrofanova vladimir dyachenko Anatoly Beskakotov Alexander Maksimov Denis Rastegaev Yury BalegaSergey Komarinsky Kazan Federal University Kazan 420008Russia Special Astrophysical Observatory of the Russian Academy of Sciences Nizhnij ArkhyzRussia 369167

The results of a study on the binary HIP 18856 and construction of its orbit are presented.New observational data were obtained at the BTA of SAO RAS in 2007-2019.Earlier,Cvetkovic et al.constructed the orbit for this system.However,it is based on six measurements,which cover a small part of the orbit.The positional parameters of the ESA astrometric satellite Hipparcos published speckle interferometric data(Mason et al.,Balega et al.,Horch et al.)and new ones were used in this study.Based on the new orbital parameters,the mass sum was calculated and the physical parameters of the components were found.The obtained orbital and fundamental parameters were compared with the data from the study by Cvetkovic et al..The comparison shows that the new orbital solution is better than the old one,since it fits new observational data accurately.Also based on a qualitative evaluation performed by Worley&Heintz,the new orbit was classified as"reliable",which means data cover more than half of the orbit with sufficient quantities of residuals of measurements.

关键词： techniques:high angular resolution,speckle interferometry stars:low-mass,fundamental parameters stars:binaries:spectroscopic stars:individual:HIP 18856

Convective Instability and Appearance of Structured Flows for Diffusion in Multicomponent Gas Mixtures

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Transactions of Nanjing University of Aeronautics and Astronautics 2014年第2期31卷 142-146页

作者： vladimir N. Kossov~ Olga V. Fedorenko Yelena A. dyachenko Kazakh National Pedagogical University Almaty 050100 Republic of Kazakhstan Institute of Experimental and Theoretical Physics al-Farabi Kazakh National University Almaty 050038 Republic of Kazakhstan Kazakh Academy of Transport and Communications Names after M. Tynyshpayev Almaty 050012 Republic of Kazakhstan

The main objective of this article is to investigate the behavior of gaseous systems with two and more independent gradients or thermodynamic forces exhibiting complicated behavior,when the convective flows occur.The existence of structural formations in these systems is shown by the schlieren method and the fast-response transducers.The linear analysis of stability can explain reasons of the appearance of convective instability in multicomponent gas mixtures.

关键词： diffusion instability of mechanical equilibrium theory of stability partial Rayleigh numbers