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Research on the HIP 18856 binary system

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

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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

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