Search Results - "Spiridonova, O"

Long-term optical spectral monitoring of a changing-look active galactic nucleus NGC 3516 – I. Continuum and broad-line flux variability by Shapovalova, A I, Popović, L Č, Afanasiev, V L, Ilić, D, Kovačević, A, Burenkov, A N, Chavushyan, V H, Marčeta-Mandić, S, Spiridonova, O, Valdes, J R, Bochkarev, N G, Patiño-Álvarez, V, Carrasco, L, Zhdanova, V E

“…Abstract In this paper, we present the long-term optical spectral monitoring of a changing-look active galactic nucleus (AGN), NGC 3516, covering 22 yr (from…”
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Search for LBVs in the Local Volume galaxies: study of four stars in NGC 4449 by Solovyeva, Y, Vinokurov, A, Sarkisyan, A, Kostenkov, A, Atapin, K, Fabrika, S, Oparin, D, Valeev, A, Bizyaev, D, Nedialkov, P, Spiridonova, O

“…ABSTRACT We continue to search for LBV stars in galaxies outside the Local Group. In this work, we have investigated four luminous stars in NGC 4449. Multiple…”
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New luminous blue variable candidates in NGC 4736 by Solovyeva, Y, Vinokurov, A, Fabrika, S, Kostenkov, A, Sholukhova, O, Sarkisyan, A, Valeev, A, Atapin, K, Spiridonova, O, Moskvitin, A, Nikolaeva, E

“…ABSTRACT We have found three new luminous blue variable (LBV) candidates in the star-forming galaxy NGC 4736. They show typical well-known LBV spectra, broad…”
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Optical Study of the Polar BM CrB in a Low State by Kolbin, A. I., Borisov, N. V., Burenkov, A. N., Spiridonova, O. I., Bikmaev, I. F., Suslikov, M. V.

“…We have performed spectroscopic and photometric studies of the poorly explored polar BM CrB. Based on ZTF survey data, we have revealed three brightness states…”
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Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and γ-ray brightness levels by Raiteri, C M, Villata, M, Carnerero, M I, Savchenko, S S, Kurtanidze, S O, Vlasyuk, V V, Marchini, A, Matsumoto, K, Lorey, C, Joner, M D, Gazeas, K, Carosati, D, Mirzaqulov, D O, Acosta Pulido, J A, Agudo, I, Bachev, R, Benítez, E, Borman, G A, Calcidese, P, Chen, W P, Damljanovic, G, Ehgamberdiev, S A, Elsässer, D, Feige, M, Frasca, A, Gaur, H, Grishina, T S, Gupta, A C, Hiriart, D, Holland, M, Horst, B, Ibryamov, S, Ivanidze, R Z, Jensen, J, Jithesh, V, Jovanovic, M D, Kiehlmann, S, Kimeridze, G N, Kishore, S, Kopatskaya, E N, Kurtanidze, O M, Larionova, E G, Lin, H C, Mannheim, K, Marinelli, C, Moreira Reyes, J, Morozova, D A, Nikolashvili, M G, Reinhart, D, Romanov, F D, Semkov, E, Seufert, J, Shishkina, E V, Sigua, L A, Skalidis, R, Spiridonova, O I, Stojanovic, M, Strigachev, A, Troitskaya, Y V, Troitskiy, I S, Tsai, A, Vasilyev, A A, Vince, O, Vrontaki, K, Wani, K, Watts, D, Zhovtan, A V

“…ABSTRACT In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and γ-ray bands…”
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Reverse Shoulder Arthroplasty with Latissimus Dorsi Transfer for Humerus Fractures Sequelae by Chirkov, N. N., Nikolaev, N. S., Kaminskii, A. V., Spiridonova, O. V.

“…Relevance. Fractures of the proximal humerus occupy the 3rd place in the structure of fractures in the elderly. Failure to treat these injuries leads to…”
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Spectroscopic and Photometric Study of the New Eclipsing Polar Gaia23cer by Kolbin, A. I., Pavlenko, E. P., Kochkina, V. Yu, Vinokurov, A. S., Shugarov, S. Yu, Sosnovskij, A. A., Antonyuk, K. A., Antonyuk, O. I., Pit’, N. V., Suslikov, M. V., Galimova, E. K., Borisov, N. V., Burenkov, A. N., Spiridonova, O. I.

“…We present the results of our optical study of the eclipsing polar Gaia23cer. We analyze the orbital brightness variability in high ( ) and low ( ) states. The…”
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De-Alloyed PtCu/C Catalysts of Methanol Electrooxidation by Men’shchikov, V. S., Guterman, V. E., Belenov, S. V., Spiridonova, O. A., Rezvan, D. V.

“…The activity of PtCu/C catalysts in methanol electrooxidation is studied in HClO 4 solution. The electrochemical behavior of catalysts is compared for samples…”
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Optical and Radio Variability of the Blazar S4 0954+658 by Vlasyuk, V. V., Sotnikova, Yu. V., Volvach, A. E., Spiridonova, O. I., Stolyarov, V. A., Mikhailov, A. G., Kovalev, Yu. A., Kovalev, Y. Y., Khabibullina, M. L., Kharinov, M. A., Yang, L., Mingaliev, M. G., Semenova, T. A., Zhekanis, P. G., Mufakharov, T. V., Udovitskiy, R. Yu, Kudryashova, A. A., Volvach, L. N., Erkenov, A. K., Moskvitin, A. S., Emelianov, E. V., Fatkhullin, T. A., Tsybulev, P. G., Nizhelsky, N. A., Zhekanis, G. V., Kravchenko, E. V.

“…We present an optical-to-radio study of the BL Lac object S4 0954+658 observations during 1998–2023. The measurements were obtained with the SAO RAS Zeiss-1000…”
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PN G068.1+11.0: A young pre-cataclysmic variable with an extremely hot primary by Mitrofanova, A. A., Shimansky, V. V., Borisov, N. V., Spiridonova, O. I., Gabdeev, M. M.

“…An analysis of spectroscopic and photometric data for the young pre-cataclysmic variable (PCV) PN G068.1+11.0, which passed through its common-envelope stage…”
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Photometric study of open clusters Berkeley 96, Berkeley 97, King 12, NGC 7261, NGC 7296 and NGC 7788 by Glushkova, E. V., Zabolotskikh, M. V., Koposov, S. E., Spiridonova, O. I., Leonova, S. I., Vlasyuk, V. V., Rastorguev, A. S.

“…We present BVR c I c CCD photometry in the fields of six Galactic open clusters toward the Perseus spiral arm. These data, complemented with J, H and K S…”
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Spectral and photometric studies of the polar USNO-A2.0 0825-18396733 by Gabdeev, M. M., Borisov, N. V., Shimansky, V. V., Spiridonova, O. I.

“…Results of photometric and spectral studies of the new magnetic cataclysmic variable (polar) USNO-A2.0 0825-18396733 are presented. Photometric data in the B ,…”
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HBHA 4705-03: A new cataclysmic variable by Yakin, D. G., Suleimanov, V. F., Vlasyuk, V. V., Spiridonova, O. I.

“…Results of photometric and spectroscopic studies for the new eclipsing cataclysmic variable star HBHA 4705-03 with an orbital period of 0.1718 days are…”
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Non-stationary emission of the blazar S4 0954+658 over a wide range of wavelength by Volvach, A. E., Bychkova, V. S., Larionov, M. G., Kardashev, N. S., Volvach, L. N., Vlasyuk, V. V., Spiridonova, O. I., Lähteenmäki, A., Tornikoski, M., Aller, M. F., Aller, H. D., Pooley, G., Carrasco, L., Porras, A., Recillas, E.

“…Data from long-term multi-frequency monitoring are used to analyze variations in the flux density of the active galactic nucleus S4 0954+658. These data were…”
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Long-term monitoring of the blazars AO 0235+164 and S5 0716+714 in the optical and radio ranges by Bychkova, V. S., Vol’vach, A. E., Kardashev, N. S., Larionov, M. G., Vlasyuk, V. V., Spiridonova, O. I., Vol’vach, L. N., Lähteenmäki, A., Tornikoski, M., Aller, M. F., Aller, H. D.

“…Long-term, multi-frequency optical and radio monitoring data for the Active Galactic Nuclei (AGNs) AO 0235+164 and S5 0716+714 are used to derive the…”
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Modeling the optical radiation of the precataclysmic variable SDSS J212531-010745 by Shimansky, V. V., Borisov, N. V., Nurtdinova, D. N., Solovyeva, Yu. N., Sakhibullin, N. A., Spiridonova, O. I.

“…Optical observations are analyzed to derive a set of basic parameters for the precataclysmic variable star SDSS J212531-010745, whose primary is a PG1159-type…”
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Characteristics of the Flare Phenomenon in Blazar AO0235+164 in Gamma, Optical, and Radio Bands by Bychkova, V. S., Volvach, A. E., Volvach, L. N., Kardashev, N. S., Larionov, M. G., Vlasyuk, V. V., Spiridonova, O. I., Lähteenmäki, A., Tornikoski, M., Tammi, J., Järvelä, E., Vera, R. J. C., Chamani, W., Enestam, S.

“…The active core of the galaxy AO0235+164 is monitored in the optical and radio bands at millimeter wavelengths. Using the multifrequency data obtained in…”
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The intermediate-age pre-cataclysmic variables SDSS J172406+562003 and RE J2013+4002 by Shimansky, V. V., Borisov, N. V., Nurtdinova, D. N., Mitrofanova, A. A., Vlasyuk, V. V., Spiridonova, O. I.

“…We have analyzed the physical status of the pre-cataclysmic variables SDSSJ172406+562003 and RE J2013+4002, which have evolved after their common-envelope…”
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Long-term optical and radio monitoring of the quasars S5 0716+714 and 4C 38.41 on various time scales by Volvach, A. E., Volvach, L. N., Bychkova, V. S., Kardashev, N. S., Larionov, M. G., Vlasjuk, V. V., Spiridonova, O. I., Lachteenmaki, A., Tornikoski, M., Nieppola, E., Aller, M. F., Aller, H. D.

“…We present the results of long-term radio and optical monitoring of two radio-loud quasars. The aim of the work was to study the objects’ variability on…”
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Photometry of the poorly studied galactic open star clusters King 13, King 18, King 19, King 20, NGC 136, and NGC 7245 by Glushkova, E. V., Zabolotskikh, M. V., Koposov, S. E., Spiridonova, O. I., Vlasyuk, V. V., Rastorguev, A. S.

“…We present the results of our BV R c I c CCD photometry for six Galactic open star clusters toward the Perseus spiral armperformed at the Special Astrophysical…”
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