Usenko I.A., Kovtyukh V.V., Miroshnichenko A.S., Danford S. «Pulsational activity of the small-amplitude Cepheid Polaris (α UMi) in 2016–2017» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 146-148 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114382 We present the results of an analysis of 49 spectra of α UMi (Polaris) obtained during August–December 2016 and January–March 2017. Frequency analysis displays an unexpected decrease of the pulsational period up to 17.3min in comparison to the 2015 observational set. The radial velocity amplitude was reduced to 3.43 km s^–1 in 2016 and to 3.31km s^–1 in the beginning of 2017 in comparison with 4.16 km s^–1 in 2015. This result is also unexpected, because during the last decade a gradual amplitude growth has been observed. The average T_eff=6021 K determined from the 2016–2017 data is close to the values determined for the 2001–2015 set.

Dmytrenko A.M., Akhmetov V.S. «Astronomical image processing for high-accurate astrometry data» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 163-165 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114458 This article presents the main results of the initial processing of some of the astronomical images obtained from the archive of the digitized photographic survey of the whole sky SuperCOSMOS. Using of the median filtering and gaussian convolution procedure with the adaptive kernel allows to carry out the initial processing of astronomical images without calibration frames. After the initial processing, the photo centers of the celestial objects were identified by various methods. It has been concluded that after the use of the mathematical methods for the initial processing of the digitized photographic images, the position of objects is calculated with a higher random and systematic precision.

Doikov D.N., Savchuk N.V., Yushchenko A.V. «Radioactive molecules in SN1987a remnant» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 69-75 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114273

Parshina S.S., Tokayeva L.K., Dolgova E.M., Afanas'yeva T.N., Samsonov S.N., Petrova V.D., Vodolagina E.S., Kaplanova T.I., Potapova M.V. «Erythrocytes functional features in the 11-year solar cycle» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 240-241 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114691 There had been studied features of rheological blood failures in patients with unstable angina (UA) in periods of the high (HSA) and low solar activity (LSA) in the 23^rd 11-year solar cycle. This category of patients is characterized by prethrombotic blood state, although they don’t have coronary thrombosis. The research aimed to study compensatory mechanisms which block thrombosis development at the solar activity increase. There had been established that the period of the solar activity increasing in the 11-year solar cycle is characterized by an increase of a blood viscosity, comparing with the period of a low solar activity. Though, erythrocytes functional features in this case are compensatory mechanisms – erythrocyte aggregation paradoxically reduced and their deformability increases. It is probably connected with the revealed fibrinogen decrease in the period of the high solar activity. We can see that the change of a solar activity is accompanied not only by the progressing of pathologic processes, but also by an activation of adaptive changes in erythrocyte membrane so0 as to prevent thrombosis. Though, the required compensatory mechanisms were found invalid, which were shown in the decrease of an oxygen delivery to tissues, and the effectiveness decrease of the medical treatment in the period of a HSA.

Shakun L., Koshkin N., Korobeynikova E., Strakhova S., Dragomiretsky V., Ryabov A., Melikyants S., Golubovskaya T., Terpan S. «Accuracy of satellite optical observations and precise orbit determination» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 242-245 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.117660 The monitoring of low-orbit space objects (LEO-objects) is performed in the Astronomical Observatory of Odessa I.I. Mechnikov National University (Ukraine) for many years. Decades-long arсhives of these observations are accessible within Ukrainian network of optical observers (UMOS). In this work, we give an example of orbit determination for the satellite with the 1500-km height of orbit based on angular observations in our observatory (Int. No. 086). For estimation of the measurement accuracy and accuracy of determination and propagation of satellite position, we analyze the observations of Ajisai satellite with the well-determined orbit. This allows making justified conclusions not only about random errors of separate measurements, but also to analyze the presence of systematic errors, including external ones to the measurement process. We have shown that the accuracy of one measurement has the standard deviation about 1 arcsec across the track and 1.4 arcsec along the track and systematical shifts in measurements of one track do not exceed 0.45 arcsec. Ajisai position in the interval of the orbit fitting is predicted with accuracy better than 30 m along the orbit and better than 10 m across the orbit for any its point.

Oknyansky V.L., Gaskell C.M., Huseynov N.A., Mikailov Kh.M., Lipunov V.M., Malanchev N.I., Tsygankov S.S., Gorbovskov E.S., Tatarnikov A.M., Metlov V.G., Shatsky K.L., Brotherton M.B., Kasper D., Du P., Chen X., Burlak M.A., Buckley D.A.H., Rebolo R., Serra-Ricart M., Podesta R., Levato H. «Ulti-wavelength monitoring of the changing-look AGN NGC 2617 during state changes» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 117-120 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114366 Optical and near-infrared photometry, optical spectroscopy, and soft X-ray and UV monitoring of the changing-look active galactic nucleus NGC 2617 show that it continues to have the appearance of a type-1 Seyfert galaxy. An optical light curve for 2010–2017 indicates that the change of type probably occurred between 2010 October and 2012 February and was not related to the brightening in 2013. In 2016 and 2017 NGC 2617 brightened again to a level of activity close to that in 2013 April. However, in 2017 from the end of the March to end of July 2017 it was in very low level and starting to change back to a Seyfert 1.8. We find variations in all passbands and in both the intensities and profiles of the broad Balmer lines. A new displaced emission peak has appeared in H_β. X-ray variations are well correlated with UV–optical variability and possibly lead by ∼2–3^d. The K band lags the J band by about 21.5±2.5^d and lags the combined B+J bands by ∼25^d. J lags B by about 3 d. This could be because J-band variability arises predominantly from the outer part of the accretion disc, while K-band variability is dominated by thermal re-emission by dust. We propose that spectral-type changes are a result of increasing central luminosity causing sublimation of the innermost dust in the hollow bi-conical outflow. We briefly discuss various other possible reasons that might explain the dramatic changes in NGC 2617.

Savastru S.V., Marsakova V.I., Andrych K.D., Dubovsky P. «Improved ephemeris of poorly studied eclipsing binary GSC 3950-00707 = 2mass J20355082+5242136» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 126-127 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.115819 We made our CCD-observations of GSC 3950-00707 by using the telescope Celestron-14 of Vihorlat Observatory and Astronomical Observatory on Kolonica Saddle. The moments of minima were calculated by using the symmetrical polynomial fit. We also analyzed the observations from automated surveys ASAS-SN and found 3 mean minima by using trigonometrical polynomial fit. The analysis of our observations and data from the surveys allows to conclude that it is the W UMa-type variable and its published period value is not accurate. We analyzed the O–C curve and corrected the elements.

Savanevych V.E., Briukhovetskyi O.B., Khlamov S.V., Pohorelov A.V., Vlasenko V.P., Dubovsky P.A., Kudzej I., Parimucha Š. «COLITECVS – new tool for automated reduction of photometric observations» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 194-197 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114495 The capabilities of telescopes allow us to make the plotting of light curves a routine task. This one shifts the main attention of astronomer from the plotting to research. To achieve this goal, we developed a new tool for automated reduction of photometric observations, which includes the computational method for the brightness assessment of the investigated and comparison stars; brightness equalization of astronomical images using inverse median filter; light curve plotting and its processing using different tools.

Kolotsey A., Atroschenco M., Dubrouski S.A., Baluk I.I «Updated light elements of 10 RRab stars in the Antlia, Caelum and Sculptor constellations» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 85-88 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.117671 This paper presents the results of verification of the periods and other characteristics of 10 variable stars. The All Sky Automated Survey (ASAS) data have been used in this verification study. 10 RRab stars in the Antlia, Caelum and Sculptor constellations have been investigated. The study was performed using the software package developed by S.A. Dubrouski and V.P. Goranski.

Smerechynskyi S.V., Dzikovskyi D.V. «Model of magnetic degenerate dwarf» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 128-134 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114380 Ключевые слова: degenerate dwarf, critical mass, relativistic parameter, spin-polarization

Vavrukh M.V., Dzikovskyi D.V. «The characteristics of electron-nuclear model in the degenerate dwarfs theory. Equation of state» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 149-158 (2017)

DOI: https://doi.org/10.18524/1810-4215.2017.30.114384 Within the microscopic theory the ground state energy of spatially homogeneous degenerate relativistic subsystem of electrons in the field of stationary nuclei of l-th sorts with charges z₁, . . . , z_l was calculated. In the two- and three-particle electron correlations approximation the contributions of Coulomb interactions to the equation of model state at low temperatures was analyzed.