Communications of the Byurakan Astrophysical Observatory最新文献_第5页

A study of active galaxies in groups of galaxies and in the field 对星系群和野外活动星系的研究

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-07 DOI: 10.52526/25792776-23.70.1-77

R. Andreasyan, S. Hakopian, A. P. Mahtessian, H. Abrahamyan, G. Paronyan, A. G. Sukiasyan

{"title":"A study of active galaxies in groups of galaxies and in the field","authors":"R. Andreasyan, S. Hakopian, A. P. Mahtessian, H. Abrahamyan, G. Paronyan, A. G. Sukiasyan","doi":"10.52526/25792776-23.70.1-77","DOIUrl":"https://doi.org/10.52526/25792776-23.70.1-77","url":null,"abstract":"We study regions with radius of 500 pc around of the central radio galaxies from our sample. For this study were chosen about 30 nearby 3C radio galaxies of different FR types. We bring the maps of optical galaxies that are overlaid on the radio map of 3C radio source. It was used also the maps of these regions in all available wavelength. Here we present more detail analyses and new results for the radio galaxy of FRI type 3C31.\u0000The dependencies of the morphological types of the first and second ranked group galaxies on the magnitude gap were studied. It is shown that there is no increase in the relative number of elliptical galaxies among the first and second ranked group galaxies with large magnitude gaps. Some results are presented on studies of a sample of about hundred galaxies (“100SBS”) from two adjacent fields of SBS, which have spectral data in SDSS. Comparative analysis was done between two classifications that the 100SBS objects got - from one side Starburst or Starforming in SDSS, from the other - SfGcont and SfGneb, with a possibility of further detailing in accordance to our scheme for star-forming galaxies.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122437881","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

Long period fluctuations of solar active regions 太阳活动区的长周期波动

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-23

G. Dumbadze

{"title":"Long period fluctuations of solar active regions","authors":"G. Dumbadze","doi":"10.52526/25792776-23.70.1-23","DOIUrl":"https://doi.org/10.52526/25792776-23.70.1-23","url":null,"abstract":"The fluctuation spectra of solar active regions (ARs) contain information about the geometrical features and ground physical processes responsible for the appearance of such a background vibration noise. The investigation is based on an analysis of a time series built photospheric magnetograms and comprises case studies of several types of AR structures. We detect characteristic properties of Fourier and wavelet spectra evaluated for the solar active region area and radial magnetic flux time series. There are long-period oscillations, similarly to the characteristic lifetimes of super-granulation, determined from the datasets of the AR total area and radial magnetic flux, respectively. According to our results the fluctuation spectra of the AR areas and radial magnetic fluxes somewhat differ from each other both in terms of values of the spectral power-law exponents, as well as their variability ranges in different consider cases. The characteristic properties of the area and radial magnetic flux fluctuation spectra for the Ars show noticeable discrepancies between each other. It can also be concluded that behind the formation of AR area and radial flux vibration spectra might be different physical mechanisms in action.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134604090","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

Byurakan Astrophysical Observatory (BAO): current activities and statuses 比拉坎天体物理天文台(BAO):目前的活动和状况

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-9

A. Mickaelian

引用次数: 0

Prof. Lyudwik Mirzoyan’s life and activity 柳德威克·米尔佐扬教授的生平和活动

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-18

V. Hambaryan, A. Akopian

引用次数: 0

Observations of Gaia Microlensing Events in Abastumani Abastumani中盖亚微透镜事件的观测

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-35

T. Kvernadze, O. Kvaratskhelia, V. V. Kozlov

{"title":"Observations of Gaia Microlensing Events in Abastumani","authors":"T. Kvernadze, O. Kvaratskhelia, V. V. Kozlov","doi":"10.52526/25792776-23.70.1-35","DOIUrl":"https://doi.org/10.52526/25792776-23.70.1-35","url":null,"abstract":"Gaia is now one of the most successful and leading transient space mission. It discovers nearly 2000 objects annually from all over the sky, down to about 20 mag, covering all possible classes of transients from supernovae and cataclismic variables to rare phenomena like microlensing events or pair-instability supernovae. The long time baseline of Gaia data allows for more robust detections of photometric anomalies. The gravitational microlensing method is especially sensitive to compact-object lenses in the Milky Way, including white dwarfs, neutron stars or black holes. The team, involved in the photometric follow-up observations of Gaia microlensing events, is collaborating with the International Working Group of Gaia Science Alerts through the BHTOM platform since 2020. Currently, we mainly use the 36-cm SCT-14 telescope of the Georgian National Astrophysical Observatory (Abastumani, Georgia) which is equipped with large format CCD and UBVRI filter set. At present we have processed and submitted for combined light curves observational data of 16 moderately bright Gaia alerts. Some of them clearly show the microlensing event type of light curves, though they need more detailed investigation. Here we present preliminary results of data connected with two such events: Gaia19dke and Gaia21dnc.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"1998 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116683442","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

Search and identification of high-velocity stars by dynamical ejection and supernovae from multiple stars 利用多恒星的动态抛射和超新星寻找和识别高速恒星

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-43

V. Hambaryan, R. Neuhaeuser

引用次数: 0

Iron in Armenian really means a Sky Drop? 铁在亚美尼亚语里真的意味着天降吗?

Communications of the Byurakan Astrophysical Observatory Pub Date : 2023-07-06 DOI: 10.52526/25792776-23.70.1-1

A. Yeghikyan

{"title":"Iron in Armenian really means a Sky Drop?","authors":"A. Yeghikyan","doi":"10.52526/25792776-23.70.1-1","DOIUrl":"https://doi.org/10.52526/25792776-23.70.1-1","url":null,"abstract":"In the languages of the ancient Hittites and Egyptians, and later the Greeks, iron was called celestial\u0000metal or by the close in meaning word. A browse review of iron names in several languages shows that\u0000with the exception of the mentioned three languages, in other languages the name of the iron reflects its\u0000function (hard, cutting, superpower, iron-stone, etc.) but not origin. According to the Hittite sources,\u0000iron was produced by the masters of the Hatti kingdom controlled by Hittities, located, by the way, next\u0000to the kingdom of Hayasa. Hatti adjoins the region on the southeastern coast of the Black Sea, where,\u0000according to Aristotle, the Halibs lived - craftsmen who produced the best iron. It is known that the\u0000mountain rivers of this area brought sand and accumulated in the mouths sand with a high content of\u0000magnetite, an iron-containing mineral with a lower melting point (compared to other rocks). It is this\u0000circumstance, according to geologists, that the beginning of the iron century takes place in this area\u0000in the XV-XIII centuries BC. On the basis of all of the above, the literal translation of the Armenian\u0000name of iron erkat = dropped from the sky does not seem to be meaningless. But academic philologists\u0000categorically disagree with this. In this report, a more convincing (from the astrophysicist point of view)\u0000etymology of the Armenian word erkat = er-ka = heavenly metal is proposed.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125856697","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

The Precise Individual Masses and Theoretical Stability and Habitability of some Single-lined Spectroscopic Binaries 某些单线光谱双星的精确个体质量、理论稳定性和可居住性

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-223

B. Algnamat, A. Abushattal, A. Kraishan, M. Alnaimat

{"title":"The Precise Individual Masses and Theoretical Stability and Habitability of some Single-lined Spectroscopic Binaries","authors":"B. Algnamat, A. Abushattal, A. Kraishan, M. Alnaimat","doi":"10.52526/25792776-22.69.2-223","DOIUrl":"https://doi.org/10.52526/25792776-22.69.2-223","url":null,"abstract":"Over the past few decades, some Spectroscopic Binaries (SBs) have been resolved using high-resolution techniques. Astrophysics is interested in this subject because we can obtain the mass of each component. By combining a visual solution with a complimentary one, such as the spectroscopic orbit or Edward method, we can determine the individual masses, semimajor axes, magnitudes, spectral types, radii, and temperatures. These provide the most probable physical parameters for some single-lined spectroscopic binaries. Then We can use these parameters to calculate theoretical the stability and habitability of the system. Additionally, we assume the composite spectrum, the apparent global magnitude, and the parallax (generally the Hipparcos, and recently the Gaia ). The next step is to obtain the spectrum for each components. The Edwards method will be used in this case. As soon as we have two spectra foe two single-lined spectroscopic binaries (HIP 754 and HIP 3841), we can determine each mass based on the magnitude difference, ∆m. For selected samples, we calculate the rest of the physical parameters needed to calculate the theoretical stability and habitability.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"14 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":"127070678","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: 1

Magnetic Field in some Selected Directions of the Galaxy: Sagittarius Spiral Arm 银河系某些特定方向的磁场:人马座旋臂

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-265

R. Andreasyan, G. Paronyan, A. G. Suqiasyan

引用次数: 0

Multiwavelength Space Astronomy 多波长空间天文学

Communications of the Byurakan Astrophysical Observatory Pub Date : 2022-12-29 DOI: 10.52526/25792776-22.69.2-287

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

引用次数: 1