Communications of the Byurakan Astrophysical Observatory最新文献_第6页

Detectors for space electronics based on the quantum dots and wells 基于量子点和量子阱的空间电子探测器

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-299

R. Ustimenko, M. Vinnichenko, H. Sarkisyan, D. Hayrapetyan, E. Kazaryan

引用次数: 0

Failure of the hypothesis of accelerated expansion of the universe 宇宙加速膨胀假说的失败

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-280

A. P. Mahtessian, G. Karapetian, M. Hovhannisyan, L. A. Mahtessian

引用次数: 1

The stellar content of UCHII regions: the molecular cloud GRSMC045.49+00.05 UCHII区域的恒星含量:分子云GRSMC045.49+00.05

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-217

N. Azatyan, E. Nikoghosyan, L. Kaper, D. Andreasyan, A. Samsonyan, A. Yeghikyan, D., Baghdasaryan, N. Harutyunyan

{"title":"The stellar content of UCHII regions: the molecular cloud GRSMC045.49+00.05","authors":"N. Azatyan, E. Nikoghosyan, L. Kaper, D. Andreasyan, A. Samsonyan, A. Yeghikyan, D., Baghdasaryan, N. Harutyunyan","doi":"10.52526/25792776-22.69.2-217","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-217","url":null,"abstract":"Ultra-compact Hii (UCHII) regions are an important phase in the formation and early evolution of massive stars. The main objectives of this work are to study the stellar content associated with the G045.49+00.04 and G045.14+00.14 star-forming regions located in the GRSMC45.46+0.05 molecular cloud at a distance of about 8kpc. Both regions contain a number of UCHII regions. The main objective is to characterize the embedded young stellar objects (YSOs), such as their mass, evolutionary age and age spread, spatial distribution, luminosity function. We used near-, mid-, and far-infrared photometric data to identify and classify the YSOs. Their main parameters were determined by the spectral energy distribution (SED) fitting tool using radiation transfer models. Totally, we identified 2864 YSOs. We also constructed a colour-magnitude diagram to compare the parameters of stellar objects with the results of the radiative transfer models. The density distribution of the identified YSOs showed the presence of dense clusters in the UCHII regions. The parameters of YSOs in the IRAS clusters and non-cluster objects surrounding them show some differences. In general, the YSOs in these clusters have an evolutionary age larger than 106 years with an age spread of a few Myr. The clusters include several high- and intermediate-mass zero-age main sequence stellar objects. The small age spread suggests that the clusters may originate from a single triggering event.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"136 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":"116384733","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}

引用次数: 0

Robotising Existing Astronomical Observatories 现有天文台机器人化

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-302

G. Tuparev, H. Andreasyan, T. Jackson

{"title":"Robotising Existing Astronomical Observatories","authors":"G. Tuparev, H. Andreasyan, T. Jackson","doi":"10.52526/25792776-22.69.2-302","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-302","url":null,"abstract":"Astronomical observatories can be operated either manually or remotely, but both of these options currently have many disadvantages. Manual observatories require real-time staffing by on-site astronomers and technicians, and observation time is often not used optimally. Remote observatories, on the other hand, often make it cumbersome or near-impossible to modify any observing schedules already fed into the system, making reacting to important events like gamma-ray bursts unrealistic. In addition, it is generally expected that the cheapest way to upgrade an ageing observatory is to simply build a new one, but this is not always the case. For many relatively modern observatories, it is possible to convert to a fully robotic mode of operation. In these proceedings, we describe a few straightforward ways to robotise an existing observatory and how to connect it to a network of other robotic observatories. We also discuss the use of inexpensive device controllers, the importance of emergency shut-down procedures, the introduction of local and network schedulers, and the implementation of fully automated observation planning. We finally also describe hardware and software solutions, including an example of how this is currently being applied.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"254 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":"126086694","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}

引用次数: 0

New concept of ground based-space radio interferometer and modern technologies application for deployment simulation of precise petal space reflector 陆基空间无线电干涉仪的新概念及现代技术在精确花瓣空间反射器展开模拟中的应用

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-308

V. Bujakas, M. Glotov

{"title":"New concept of ground based-space radio interferometer and modern technologies application for deployment simulation of precise petal space reflector","authors":"V. Bujakas, M. Glotov","doi":"10.52526/25792776-22.69.2-308","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-308","url":null,"abstract":"Radio interferometers make it possible to achieve high resolution of astronomical observations due to the large base of the measuring instrument. The ground-space radio telescope RadioAstron holds the record for angular resolution among radio interferometers, its maximum base was about 340 000. km. The project turned out to be very successful. The new concept is based on the experience of the RadioAstron project and proposes the use of several orbiting radio telescopes that work together in the cm and mm spectral regions. This will further increase the base of the radio interferometer and expand the viewing angle at each current moment of time. Modern technical means make it possible to launch into orbit several identical mirrors operating in the short-wavelength region of the spectrum with an effective area no worse than the effective area of the RadioAstron antenna at a wavelength of 1.35 cm. Thus, the project can be quite budgetary. Now 3D modeling and 3D printing technologies make it possible to speed up and simplify the development of physical models. The manufacture of complex parts used to take days of work. Now we can use 3D printing to make different parts in a matter of hours. In the physical model of a new petal mirror project, we used FDM and LCD printing technologies. The paper discusses examples of manufacturing petal mirror physical model components, limitations and features of these technologies.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"114 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":"122827901","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}

引用次数: 0

Detailed investigation of QSO1055+01 QSO1055+01的详细调查

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-345

L. A. Mahtessian, M. Hovhannisyan, R. A. Karapetyan, L. A. Amiraghyan, M.L. Grigoryan, A. P. Mahtessian

引用次数: 0

Application of radio wave reflections from meteor showers falling into the near-Earth space for organizing communications in the subpolar regions of the Earth 流星雨射入近地空间的无线电波反射在组织地球亚极地地区通信中的应用

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-315

S. Zavjalov, S. Makarov, I. Lavrenyuk, A. Aharonyan, V. Avetisyan

引用次数: 0

Astronomical Surveys, Catalogues, Archives, Databases and Virtual Observatories 天文调查，目录，档案，数据库和虚拟天文台

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-179

A. Mickaelian, H. Abrahamyan, G. Paronyan, G. Mikayelyan

{"title":"Astronomical Surveys, Catalogues, Archives, Databases and Virtual Observatories","authors":"A. Mickaelian, H. Abrahamyan, G. Paronyan, G. Mikayelyan","doi":"10.52526/25792776-22.69.2-179","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-179","url":null,"abstract":"Astronomical surveys and catalogs are the main sources for the discovery of new objects, both Galactic and extragalactic. Archives and Databases maintain billions of astronomical objects; planets, comets, stars, exoplanets, nebulae, galaxies, and quasars. We will review the current background in astronomy\u0000for further all-sky or large-area studies. Modern astronomy is characterized by multiwavelength (MW) studies (from gamma-ray to radio) and Big Data (data acquisition, storage, mining and analysis). Present astronomical databases and archives contain billions of objects observed at various wavelengths, and the\u0000vast amount of data on them allows new studies and discoveries. Surveys are the main source also for accumulation of observational data for further analysis, interpretation, and achieving scientific results. We review the main characteristics of astronomical surveys (homogeneity, completeness, sensitivity, etc.), compare photographic and digital eras of astronomical studies (including the development of wide-field\u0000observations), and describe the present state of MW surveys. Among others, Fermi-GLAST, INTEGRAL (gamma-ray), ROSAT, Chandra, XMM (X-ray), GALEX (UV), DSS1/2, SDSS, Hubble, Gaia (optical), 2MASS, IRAS, AKARI, WISE, Herschel (IR), NVSS and FIRST (radio) surveys and major astronomical archives and databases will be presented and discussed, as well as surveys and databases for variable and transit objects.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"91 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":"129458513","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}

引用次数: 0

Evolution of spectral lines under time-dependent illumination of an absorbing and scattering atmosphere 吸收和散射大气随时间光照下光谱线的演化

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-140

A. Nikoghossian

引用次数: 2

Youth project Space-π using small spacecraft for research of near-Earth space and remote sensing of the earth 青年项目空间-π利用小型航天器研究近地空间和遥感地球

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-295

R. Ustimenko, M. Vinnichenko, H. Sarkisyan, D. Hayrapetyan, E. Kazaryan

引用次数: 0