Communications of the Byurakan Astrophysical Observatory最新文献

{"title":"Archaeoastronomy. On “Observational Technologies” in Ancient Armenia","authors":"H. A. Malkhasyan","doi":"10.52526/25792776-22.69.2-324","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-324","url":null,"abstract":"The paper provides some general information on the recent studies of the “Zorats Qarer” megalithic monument, in particular, some “observational instruments” and the possible observational methodology. Several types of “observational tools” are described, namely “observational platforms” that have their own “guiding stones”, stones with holes and the so-called “angular stones”. Observational “stone tools” of the “mixed type” (multifunctional) were also found in the monument. Recent studies have also shown that the observations were made in 3 main positions: standing, sitting (“on the seating platform”) and kneeling. With the help of the mentioned instruments, apart from the sunrise and sunset of the solstices and equinoxes, the heliacal rising and setting of bright stars, as well as their acronycal rising and cosmical setting were observed in the monument as well. In addition to the mentioned phenomena, apparent appearance and disappearance of stars at the points above the horizon were observed. The observers were also interested in the transitions of the stars in their upper and lower (for circumpolar stars) culmination points. The mentioned “technologies” were mainly used between the 9th and 3rd millennia BC.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"493 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124435704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Semi-detached double-lined eclipsing binaries with Gaia DR3 data","authors":"O. Malkov, A. D. Grinenko, A. M. Sachkov","doi":"10.52526/25792776-22.69.2-201","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-201","url":null,"abstract":"Semi-detached double-lined eclipsing binaries (SD DLEB) play an important role in our understanding of basic properties of interacting binaries. We have collected data on semi-detached systems with available light and radial velocity curve solutions, and have compiled the most comprehensive list of SD DLEB, containing astrophysical and orbital parameters. The goal of this work was to make a cross-identification of the catalogued objects with Gaia DR3 archive. We have supplied our catalogue with data from Gaia DR3 as well as multicolor photometry from SIMBAD, and make a preliminary analysis of the results.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133584162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biermann Battery and Magnetic Fields of Accretion Discs","authors":"R. Andreasyan","doi":"10.52526/25792776-22.69.2-274","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-274","url":null,"abstract":"Magnetic fields should be studied to understand different processes in accretion discs, such as transition of angular momentum which is closely connected with them. There are different ways to describe the growth of magnetic fields of cosmic objects. One of them is based on Biermann battery mechanism which previously has been used to study the origin of magnetic fields in galaxies. It is based on different masses and same absolute values of charges of protons and electrons, which move across the disc. They interact with rotating medium, get azimuthal velocity and produce circular currents that are associated with the magnetic fields in the disc. Such magnetic field influences the motion of the charged particles that created it, and we should take into account the feedback. Mathematical description of this mechanism leads us to the Fredholm-type integral equation of the 2nd kind. In the presented work it is solved numerically using Galerkin methods. Here we give the solutions of different cases.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129351665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A planetary resonant effect in Parker stellar dynamo","authors":"D. Sokoloff, A. Serenkova, E. Yushkov","doi":"10.52526/25792776-22.69.2-231","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-231","url":null,"abstract":"The effect of periodic pumping on dynamo generation in the simplest Parker model is studied in this work. Pumping is understood in the sense that the periodic parameters oscillations in the dynamo system leads to a change in the rate of the exponential growth of the mean magnetic field. And since the Parker model simultaneously describes its time oscillations as the field grows, this phenomenon is very similar to parametric resonance in the classical model of a harmonic oscillator. With the help of asymptotic analysis and numerical simulation, we demonstrate both pump regions similar to parametric resonance, as well as different amplification regions at high driving force frequencies, and suppression regions at low frequencies, find the gain maximum and investigate the behavior of the critical pump frequency separating the regions of generation and suppression.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114714073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On mass-loaded accretion during high mass star formation","authors":"A. Yeghikyan, A. Samsonyan, N. A. Harutyunyan, N. Azatyan, D. Andreasyan, D. Baghdasaryan, E. Nikoghosyan","doi":"10.52526/25792776-22.69.2-172","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-172","url":null,"abstract":"Analytical formulae of the dependence of the velocity and density on the radius during spherical accretion with both mass and momentum inputs, as well as the rate of mass inflow are presented. Some features of gas inflow near the star are discussed, and details of mass loading are presented and calculated as caused by hydrodynamical ablation and conductivity. It looks like that in one example velocities of inflow are in the range from 10-20 km/s (free fall) to 40-50 km/s and the densities are in the range from 2 · 108\u0000(free fall) to 6 · 106 cm−3 at 1017 cm when mass-loading accretion is taken place during formation of 10M⊙ mass star.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125142743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Substructures in the Isolated Galaxy clusters","authors":"E. Panko, S. Yemelianov, A. Sirginava, Z. Pysarevskyi","doi":"10.52526/25792776-22.69.2-256","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-256","url":null,"abstract":"The isolated clusters are special objects for understanding the ways of forming observed large-scale distributions of matter. One can consider the isolated clusters as objects evolving without any external influence. We present the results of the analysis of the 2D distribution of galaxies in 31 isolated galaxy clusters with redshifts z < 0.15 and the distance to the nearest neighbor less than 60h−1Mpc. We defined the morphological types of these clusters accordingly to advance Panko’s classification scheme using the “Cluster Cartography” set. The main part of these clusters belongs to the open O-type clusters without any signs of a complex structure. However, we detected the presence of the inner regular substructures for 10 clusters. They are linear substructures, X- and Y-type crosses, and compact short chains. All substructures were detected on a statistically significant level. The detected substructures have special orientations of galaxies, which note to their 3D type. Practically all studied galaxy clusters are young.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114860534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Place and Role of Astronomy and Astrophysics in the Emerging New Model of Education","authors":"L. A. Gheonjian","doi":"10.52526/25792776-22.69.2-187","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-187","url":null,"abstract":"Developing digital technologies as an evolutionary leap, we are clearly facing a crisis in traditional education system. We are close, or are already at the bifurcation point of techno-cultural evolution. Systems Theory (Bertalanffy (1968)) and the concept of Purposeful Systems (Ackoff & Emery (2009), Ackoff et al. (2006)) focuses on the design of a new model of education. The main difficulty of education is caused by contradictions between the fuzzy logic (Zadeh (1973)) of the humanities and the clear logic of natural sciences. Lingvistic variables of fuzzy logic, reflecting and classifying the multiplicity of objects and connections, allow fuzzy interpretation of reality. The concepts of number and measure achieve convergence in the identification of objects, in their study and in the creation of new objects of reality. Problems arise in the process of combining these two logics in education. Psychology, responsible for understanding of teaching-learning processes, encounters difficulties in solving these problems. Ethology, studying the social behavior of animals and humans, firmly argue that without solving the problems of education as a form of intelligence development, we become an endangered biological species if the environment we have created will be destroyed. We will return to the primitive, animal form of social behavior, since the form of social organization are transmitted genetically and lie deep in our subconscious (Dolnik (2009), Lorenz (1963, 1971)). The digitalization and standardization of education started replacing part, or all of the intelligence with the ability to use databases of” recipes” for recognizing situations and appropriate behavior. Repetitions of each such recipe creates a fixed set of unconscious behavior (Uznadze (1995)) turning people into state of cybernetic organism. This perspective causes some blurred models of the present and gloomy forecasts and plans of social reconstruction. There is the need to clearly describe the reality in which our biological species exists and to transfer this knowledge into the process of education in the form of intellectual development.\u0000Astronomy and astrophysics have created the most fully formulated model of the Universe, that becomes an essential part of culture and practice. The analysis of the intellectual activity of our civilization identifies astronomers and astrophysicists as a special group of purposeful and advanced carriers of intellect which the great potential for formation of a new model of education. The development of astronomy and astrophysics can be represented as a continuous process of transforming the concepts of fuzzy logic into constructing the model the Universe as observable, measurable and clearly described system. The specificity of the subject of study, the need to constantly develop complex specific technologies for remote research and the need to use the most advanced methods for describing, interpreting and understanding the results, created c","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130726220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Exoplanets Catalogues and Archives: An Astrostatistical Analysis","authors":"A. Abushattal, A. Kraishan, O. S. Alshamaseen","doi":"10.52526/25792776-22.69.2-235","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-235","url":null,"abstract":"The discovery of more than 5000 exoplanets based on several methods will improve our understanding of the formation and evolution of the exoplanets. Due to the dramatically increases in the amount of the astronomical data in recent decades. Which can be analyzed statistically to extract scientific information and test astrophysical theories. This information is valuable to figure out if there is a life somewhere else on the universe. This work presents a statistical analysis of all these exoplanets based on three primary data sources: NASA Exoplanet Archive, Open Exoplanet Catalogue, and Exoplanet.eu catalogue. Moreover, several parameters are examined, including mass, radius, discovery method, distance, orbital period, and discovery year. As part of our analysis, we have also clarified and summarized the data in the form of graphs based on astrophysical correlations.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123561132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Search and study of young infrared stellar clusters","authors":"N. Azatyan","doi":"10.52526/25792776-22.69.2-351","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-351","url":null,"abstract":"The “bricks” of the Galactic disc are giant molecular clouds, which are birthplaces of stellar population. Therefore, there is a genetic connection between young stellar objects (YSOs) and their surrounding Interstellar Medium (ISM). The thesis is devoted to a search for young stellar clusters in the vicinity of IRAS sources and a detailed study of three selected star-forming regions: IRAS 05137+3919, 05168+3634, and 19110+1045, which includes determining the parameters of the ISM based on far-infrared data, the identification and classification of YSOs using color-color and color-magnitude diagrams, the modeling of stellar parameters, and the construction and interpretation of the luminosity functions. It is likely that the three young stellar clusters were formed under different scenarios. The age spread of the IRAS05137+3919 and IRAS05168+3634 regions is much larger, and, therefore, we concluded that the stellar population is formed as a result of independent condensations. The age spread of the IRAS clusters’ members in the third region, which is a pair of ultra-compact HII regions (UCHIIs), namely G45.12+0.13 and G45.07+0.13, is small. The small age spread suggests that the clusters may originate from a single triggering event. Moreover, high-mass YSOs were obtained only in the G45.07+0.13 and G45.12+0.13 UCHII regions where the ISM initial density was higher and the star formation proceeded relatively quickly.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124362504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Physical Parameters, Stability, and Habitability of some Double-lined Spectroscopic Binaries","authors":"H. A. Alameryeen, A. Abushattal, A. Kraishan","doi":"10.52526/25792776-22.69.2-242","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-242","url":null,"abstract":"Large ground telescopes can now resolve most double-lined binaries optically at some point in their orbit due to the improvement of imaging techniques in recent decades. Using additional information about these systems, such as astrometric parallax, even a single precise visual observation can provide a 3D orbit and the primary physical parameters. Furthermore, both the visual and spectroscopic orbits can be determined. We combine the Edward method with the visual solution and the spectroscopic orbit parameters: period (P), periastron epoch (T), eccentricity (e), semimajor axis (a1,2) and inclination (i), we also know the mass ratio of the system. The developed method allows us to select doublelined spectroscopic systems with recently calculated orbits. We calculate the individual masses, orbital parallax, and other fundamental astrophysical parameters. The purpose of these parameters is to verify the reliability of the data received from space missions and to calculate the stability and habitability, which is the primary goal of this study. Astronomical information can be obtained from binary stars. By observing short period binaries using both spectroscopy and interferometry, we can determine the individual masses and orbital parallaxes of the objects based on their corresponding orbits. Spectroscopic binaries with double-lines are therefore fundamentally important to optically resolve. To determine the required telescope aperture for the resolution of a spectroscopic binary, we developed a specific algorithm. Wedetermined the most probable maximum and minimum separations between each spectroscopic binary based on photometric and spectroscopic information. Thus, we also determined the different physical parameters of each system by using the calibrations we obtained in our study. Based on optically resolved spectroscopic binaries with both spectroscopic and visual orbits, the methodology presented here was successfully tested.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124577787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}