Abdullah A.H., Kroupa P. «The Dichotomy of the Mass-Radius Relation and the Number of Globular Clusters» Письма в Астрономический журнал: Астрономия и космическая физика, 47, № 3, с. 205 (2021)
DOI: 10.31857/S0320010821030025
Письма в Астрономический журнал: Астрономия и космическая физика, 47, № 3, с. 205 (2021) | Рубрика: 18
Ismailov N.Z., Adigezalzade A.N., Bashirova U.Z. «Circustellar matter activity in AE/BE Herbig star MWC 614» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 78-84 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.117155 The results of spectral observations of the Herbig Ae/Be type star HD 179218 are presented. Two wave-like cycles of variability in the parameters of hydrogen lines Hα and Hβ with a characteristic time of ∼40 days are revealed. The first wave of variations is deeper; the branches of decreasing and increasing the spectral parameters of the lines are more clearly expressed. At the time of the first minimum, in the profile of the emission line Hα the appearance and disappearance of additional blue and red emission components are observed. At the same time, narrow absorption components were discovered in the Hβ line. Possible mechanisms of the observed variability of the star are discussed.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 78-84 (2017) | Рубрика: 18
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 23rd 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.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 240-241 (2017) | Рубрика: 18
Khramtsov V., Akhmetov V. «Supervised automatic identification of extragalactic sources in the WISExSuperCOSMOS catalogue» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 178-181 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114465 We present new catalogue of ∼8,500,000 extragalactic objects as a result of automatic classification of WISE and SuperCOSMOS (SCOS) cross-identification product. The main goal is to create a set of candidates in extragalactic objects due to colour (photometric) features through machine learning techniques. Extragalactic sources were separated from stars in high-dimensional colour space using Support Vector Machine (SVM) classifier. Construction of catalogue of the extragalactic objects is based on the four important procedures: 1. Cross-identification of the WISExSCOS catalogues. 2. Training set creation (Gaia DR1 and 2MASX\XSC data). 3. Feature engineering and colour-space constructing for further learning and classification. 4. Fine-tuning of SVM and separation and classification processes. In result we got high-accuracy (∼98%) algorithm for extragalactic source identification in built colour space. Product of algorithm realization is presented as photometric catalogue of the extragalactic objects and can be used for further astronomical investigations.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 178-181 (2017) | Рубрика: 18
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.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 163-165 (2017) | Рубрика: 18
Алешкин В.М., Bouttout A., Субботкин А.О., Benferhat M.L., Amara M. «Акустика мечети Кетшава в Алжире» Акустический журнал, 67, № 3, с. 308-318 (2021)
Представлены результаты акустического обследования крупной соборной мечети Кетшава (Ketchaoua), расположенной в г. Алжир (Алжирская Народная Демократическая Республика), а также обзор на ее примере основных проблем акустики молельных залов культовых сооружений, таких как храмы и мечети. Мечеть построена в XVII веке и является одной из основных достопримечательностей столицы Алжира. Измерения в молельном зале мечети проведены согласно международной методике ISO 3382. Приводятся данные по времени реверберации, разборчивости речи и другим критериям акустического качества. Анализ полученных результатов и субъективная оценка акустики мечети показывают, что разборчивость речи в молельном зале недостаточна. Измеренные акустические критерии сопоставляются с оптимальными значениями и результатами обследования некоторых других мечетей. Формулируются возможные пути решения улучшения качества звучания архитектурно-акустическими методами. DOI: 10.31857/S0320791921030011
Акустический журнал, 67, № 3, с. 308-318 (2021) | Рубрика: 11.01
Andrievsky S.M., Korotin S.A., Hill V., Zhukova A.V. «Zirconium abundances in the central part of the DsPH Fornax galaxy» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 54-56 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.117154 We derived LTE zirconium abundance in a sample of 81 giant stars in dwarf spheroidal Fornax galaxy. The LTE synthesis was used for this aim. We obtained the lower Zr abundance in Fornax galaxy comparing to the relevant value in the thick/thin disc of the Milky Way. We note that this result may be affected by the NLTE effects that decrease the real zirconium abundance.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 54-56 (2017) | Рубрика: 18
Andrych K.D., Andronov I.L., Chinarova L.L. «Statistically optimal modeling of flat eclipses and exoplanet transitions. The "Wall-Supported Polynomial" (WSP) algoritms» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 57-62 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.118521 The methods for determination of the characteristics of the extrema are discussed with an application to irregularly spaced data, which are characteristic for photometrical observations of variable stars. We introduce new special functions, which were named as the “Wall-Supported Polynomial” (WSP) of different orders. It is a parabola (WSP), constant line (WSL) or an “asymptotic” parabola (WSAP) with “walls” corresponding to more inclined descending and ascending branches of the light curve. As the interval is split generally into 3 parts, the approximations may be classified as a “nonpolynomial splines”. These approximations extend a parabolic/linear fit by adding the “walls” with a shape, which asymptotically corresponds to the brightness variations near phases of the inner contact. The fits are compared to that proposed by Andronov (2010, 2012) and Mikulasek (2015) and modified for the case of data near the bottom of eclipses instead of wider intervals of the light curve. The WSL method is preferred for total eclipses showing a brightness standstill. The WSP and WSAP may be generally recommended in a case of transit eclipses, especially by exoplanets. Other two methods, as well as the symmetrical polynomials of statistically optimal order, may be recommended in a general case of non-total eclipses. The method was illustrated by application to observations of a newly discovered eclipsing binary GSC 3692-00624 = 2MASS J01560160+5744488, for which the WSL method provides 12 times better accuracy
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 57-62 (2017) | Рубрика: 18
Kudashkina L.S., Andronov I.L. «Phase plane analysis of the photometrical variations of long-period variables» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 93-97 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114346 Using the phase plane diagrams, the phase light curves of a group of the Mira-type stars and semi-regular variables are analyzed. As generalized coordinates х and x-dot, we have used m – the brightness of the star and its phase derivative. We have used mean phase light curves using observations of various authors. The data typically span a large time interval (nearly a century). They were compiled from the databases of AAVSO, AFOEV, VSOLJ, ASAS and approximated using a trigonometric polynomial of statistically optimal degree. As the resulting approximation characterizes the auto oscillation process, which leads to a photometrical variability, the phase diagram corresponds to a limit cycle. For all stars studied, the limit cycles were computed. For a simple sine-like light curve, in e.g., L2 Pup, the limit cycle is a simple ellipse. In a case of more complicated light curve, in which harmonics are statistically significant, the limit cycle has deviations from the ellipse. In an addition to a classical analysis, we use the error estimates of the smoothing function and its derivative to constrain an “error corridor” in the phase plane.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 93-97 (2017) | Рубрика: 18
Tvardovskyi D.E., Marsakova V.I., Andronov I.L. «Effects of the mass transfer and presence of the third components in close binary stellar systems» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 135-139 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.115463 n our research, we have studied 6 close binary stellar systems which are eclipsing variables of β Lyrae and W Ursae Majoris types of variability. We have studied their O–C curves. To build them, we used moments of minima, listed in the BRNO database. Also, we used ones, which we obtained as the result of processing of observational data taken from AAVSO database. As the result of the O–C analysis, we detected that all of these stars have parabolic O–C curves, which might be caused by mass transfer from one component to another. In an addition, 3 from researched stars (U Peg,V0523 Cas and WZ Cyg) have superimposed parabolic and cyclic O–C changes that could be caused by presence of the third components in the systems. Also, we calculated minimal possible masses of third components, rates of the mass transfer for these systems and corrected the ephemerides.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 135-139 (2017) | Рубрика: 18
Andronov I.L. «Odessa scientific school of researchers of variable stars: from V.P. Tsesevich (1907–1983) to our days» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 252-255 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.118686 The biography of Vladimir Platonovich Tsesevich (11.11.1907–28.10.1983), a leader of the astronomy in Odessa from 1944 to 1983, is briefly reviewed, as well as the directions of study, mainly the highlights of the research of variable stars carried out by the members of the scientific school founded by him. The directions of these studies cover a very wide range of variability types – “magnetic” and “non-magnetic” cataclysmic variables, symbiotic, X-Ray and other interacting binaries, classical eclipsers and “extreme direct impactors”, pulsating variables from DSct and RR through C and RV to SR and M. Improved algorithms and programs have been elaborated for statistically optimal phenomenological and physical modeling. Initially these studies in Odessa were inspired by ("with a capital letter") Vladimir Platonovich Tsesevich. who was a meticulous Scientist and brilliant Educator, thorough Author and the intelligibly explaining Popularizer, persevering Organizer and cheerful Joker – a true Professor and Teacher. He was “the Poet of the Starry Heavens”.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 252-255 (2017) | Рубрика: 18
Andruk V., Yuldoshev Q., Eglitis I., Pakuliak L., Mullo-Abdolov A., Vaviliva I., Protsyuk Yu., Relke H., Golovnia V., Shatokhina S., Yizhakevych O., Ehgamberdiev Sh., Muminov M., Kokhirova G., Kazantseva L. «On the concept of the enhanced FON catalog compilation» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 159-162 (2017)
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 159-162 (2017) | Рубрика: 18
Golovnia V., Yizhakevych O., Shatokhina S., Andruk V. «Photographic observations of solar system bodies at the Main astronomical observatory of NAS of Ukraine: final results» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 170-173 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114463 Astrometric photographic observations of Solar system bodies in the frame of different programs were made at MAO NAN of Ukraine during 1950–2005. 9245 plates with the images of planets and their natural satellite, Moon, minor planets, comets and artificial satellites were obtained and processed in the late 20th century. At the beginning of the 21st century, the UkrVO Joint Digital Archive (JDA) was created, which is accessible at the МAO NAS resources (http://gua.db.ukr-vo.org/archivespecial.php). To digitize the plate archive for the JDA database, flat bed scanners were used and the software was specially developed on the basis of the LINUX/MIDAS/ROMAFOT software for the processing of wide-field images, as well as searching for the images of minor planets and comets on the Northern sky survey program plates. Up to the present time, the photographic plates with images of outer planets and their satellites have been re-processed. The final result of the long-lasting program of the photographic positional observations of Solar system bodies are summarized and presented in this publication.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 170-173 (2017) | Рубрика: 18
Kashuba S., Andruk V., Kashuba V. «On the digitisation of Odessa collection of astronomical negatives. Examination of the Epson perfection V 700 photo scanner» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 174-177 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114277 Ключевые слова: astronegative, scanning, processing of digitized plates
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 174-177 (2017) | Рубрика: 18
Mullo-Abdolov A., Kokhirova G., Relke H., Yuldoshev Q., Protsyuk Yu., Andruk V. «Investigation of the Microtek ScanMaker 1000XL PLUS scanner of the Institute of astrophysics of the Academy of Sciences of the Republic of Tajikistan» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 186-189 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114407 This work was done to estimate the accuracy of the processing method of photographic plates and the detailed study of the Microtek ScanMaker 1000XL Plus scanner, which plans to be used for the digitizing of about 1600 photographic plates of the Astrophysics Institute of the Academy of Sciences of the Republic of Tajikistan (Dushanbe) recorded for the FON project. For the processing of these photographic plates will be used software created in the LINUX/MIDAS/ROMAFOT environment. Six sequential scans of a single plate (1150, the Pleiades cluster) with a spatial resolution of 1200 dpi were processed to evaluate the repeatability of the scanner's astrometric and photometric errors. The size of photographic plates is 8×8 degrees (30×30 cm or 13000×13000 pixels). The estimated errors of the scanner for the stars brighter than B<13.5m are σxy=±0.054 pixels for the rectangular coordinates and σm=±0.020m for the instrumental magnitudes. The estimated astrometric accuracy of the processing of stellar fields of photographic plates in the system of the Tycho-2 catalogue is σαδ=±0.13".
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 186-189 (2017) | Рубрика: 18
Yizhakevych O., Andruk V., Pakuliak L. «Catalogue of astrometric positions of Jupiter’s outer satellites on photographic observations in MAO NAS of Ukraine in 1987–1993» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 201-204 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114529 The catalog of 33 topocentric positions of Jupiter’s moons J6, J7, J8 has been created on photographic observations made in MAO NASU in 1987–1993. Positions are referred to the system of TYCHO-2 using the program package INUX/MIDAS/ROMAFOT. The comparison of observed positions was made online with their theoretical data of IMCCE (www.imcce.fr/sat).
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 201-204 (2017) | Рубрика: 18
Shatokhina S.V., Kazantseva L.V., Yizhakevych O.M., Eglitis I., Andruk V.M. «Asteroids search results in large photographic Sky Surveys» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 198-200 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114510 Photographic observations of XX century contained numerous and varied information about all objects and events of the Universe fixed on plates. The original and interesting observations of small bodies of the Solar system in previous years can be selected and used for various scientific tasks. Existing databases and online services can help make such selection easily and quickly. The observations of chronologically earlier positions, photometric evaluation of brightness for long periods of time allow refining the orbits of asteroids and identifying various non-stationaries. Photographic observations of Northern Sky Survey project and observations of clusters in UBVR bands were used for global search for small bodies of Solar system. Total we founded 2486 positions of asteroids and 13 positions of comets. All positions were compared with ephemeris. It was found that 80 positions of asteroids have a moment of observation preceding their discovery, and 19 of them are chronologically the earliest observations of these asteroids in the world.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 198-200 (2017) | Рубрика: 18
Yuldoshev Q.H., Muminov M.M., Ehgamberdiev Sh.A., Relke H., Protsyuk Yu.I., Kovylianska O.E., Protsyuk S.V., Andruk V.M. «Catalogue of coordinates and B-magnitudes in –20° – +2° zone based on the Ulugh Beg Astronomical institute part of the FON project» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 205-208 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.114443 Catalogue of 13.4 million stars down to 17.5m was obtained in 2017 by using plates from the Kitab Observatory of Ulugh Beg Astronomical Institute (UBAI) of the Uzbek Academy of Sciences. Kitab's part of Photographic Sky Survey (Russian abbreviation is FON, in next contexts) project include more than 2600 photographic plates, exposed on the Double Astrograph of Zeiss (DAZ, D/F=40/300, 69"/mm) from 1981 to 1996. Digitizationof these plates was made by using Epson Expression 10000XL scanner with the 1200 dpi resolution. Catalogue includes objects from the 1963 plates in declination zone between –20° and +2° for middle epoch 1984.97. The equatorial coordinates of objects were determined in the Tycho-2 reference system and the B-magnitudes in the system of the photoelectric standards. Five participants from Uzbekistan, Germany and Ukraine have taken part in the processing of the digitized images. The average internal accuracy of the catalogue for one observation are 0.23" and 0.15m for the equatorial coordinates and B-magnitudes respectively. For the stars brighter than 14m the errors are 0.09" and 0.05m respectively. The analysis of the catalogue and its comparison with the several astrometric catalogues was done.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 205-208 (2017) | Рубрика: 18
Andrych K.D., Andronov I.L., Chinarova L.L. «Statistically optimal modeling of flat eclipses and exoplanet transitions. The "Wall-Supported Polynomial" (WSP) algoritms» Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 57-62 (2017)
DOI: https://doi.org/10.18524/1810-4215.2017.30.118521 The methods for determination of the characteristics of the extrema are discussed with an application to irregularly spaced data, which are characteristic for photometrical observations of variable stars. We introduce new special functions, which were named as the “Wall-Supported Polynomial” (WSP) of different orders. It is a parabola (WSP), constant line (WSL) or an “asymptotic” parabola (WSAP) with “walls” corresponding to more inclined descending and ascending branches of the light curve. As the interval is split generally into 3 parts, the approximations may be classified as a “nonpolynomial splines”. These approximations extend a parabolic/linear fit by adding the “walls” with a shape, which asymptotically corresponds to the brightness variations near phases of the inner contact. The fits are compared to that proposed by Andronov (2010, 2012) and Mikulasek (2015) and modified for the case of data near the bottom of eclipses instead of wider intervals of the light curve. The WSL method is preferred for total eclipses showing a brightness standstill. The WSP and WSAP may be generally recommended in a case of transit eclipses, especially by exoplanets. Other two methods, as well as the symmetrical polynomials of statistically optimal order, may be recommended in a general case of non-total eclipses. The method was illustrated by application to observations of a newly discovered eclipsing binary GSC 3692-00624 = 2MASS J01560160+5744488, for which the WSL method provides 12 times better accuracy
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 57-62 (2017) | Рубрика: 18
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.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 126-127 (2017) | Рубрика: 18
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.
Публикации Одесской астрономической обсерватории (Odessa Astronomical Publications, Украина), 30, с. 85-88 (2017) | Рубрика: 18