Search Results - "Atapin, K"

Optical Counterparts of Ultraluminous X-Ray Sources NGC 4559 X-10 and NGC 4395 ULX-1 by Vinokurov, A., Fabrika, S., Atapin, K.

“…We study the optical counterparts of ultraluminous X-ray sources (ULXs) NGC 4559 X-10 and NGC 4395 ULX-1. Their absolute magnitudes, after taking reddening…”
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Ultraluminous X-Ray Sources by Fabrika, S. N., Atapin, K. E., Vinokurov, A. S., Sholukhova, O. N.

“…Ultraluminous X-ray sources (ULXs) were identified as a separate class of objects in 2000 based on data from the Chandra X-Ray Observatory. These are unique…”
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I -band photometry of the quiescent black hole X-ray nova GROJ0422 + 32 = V518 Per: modelling of the orbital light curve and estimation of the black hole mass by Cherepashchuk, A M, Khruzina, T S, Atapin, K E

“…ABSTRACT We present new photometric observations of the X-ray nova GRO J0422 + 32 (V518 Per) carried out in the I$_c$ band over 14 nights in 2020–2023. We had…”
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Search for LBVs in the Local Volume galaxies: study of two stars in NGC 1156 by Solovyeva, Y, Vinokurov, A, Tikhonov, N, Kostenkov, A, Atapin, K, Sarkisyan, A, Moiseev, A, Fabrika, S, Oparin, D, Valeev, A

“…ABSTRACT We continue the search for luminous blue variables (LBVs) in Local Volume galaxies in order to study their fundamental parameters. In this paper, we…”
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The Nature of the Emission Spectrum of NGC 7793 P13: Testing the Supercritical Accretion Disk Wind Model by Kostenkov, A., Vinokurov, A., Atapin, K., Solovyeva, Y.

“…The optical spectra of ultraluminous X-ray sources (ULXs) show signs of powerful outflows of matter. These outflows are responsible for the formation of a…”
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New luminous blue variable candidates in the NGC 247 galaxy by Solovyeva, Y, Vinokurov, A, Sarkisyan, A, Atapin, K, Fabrika, S, Valeev, A F, Kniazev, A, Sholukhova, O, Maslennikova, O

“…ABSTRACT We search for luminous blue variable (LBV) stars in galaxies outside the Local Group. Here we present a study of two bright Hα sources in the NGC 247…”
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Post-AGB candidate IRAS 02143+5852: Cepheid-like variability, three-layer circumstellar dust envelope and spectral features by Ikonnikova, N P, Burlak, M A, Dodin, A V, Shugarov, S Yu, Belinski, A A, Fedoteva, A A, Tatarnikov, A M, Rudy, R J, Perry, R B, Zheltoukhov, S G, Atapin, K E

“…ABSTRACT We present the results of multicolour UBVRCICJHK photometry, spectroscopic analysis and spectral energy distribution (SED) modelling for the post-AGB…”
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Investigation of the Ultraluminous X-ray Source VII Zw 403 ULX in the X-ray and Optical Ranges by Vinokurov, A. S., Atapin, K. E., Kostenkov, A. E., Solovyeva, Yu. N.

“…We present the results of our analysis of the series of X-ray observations, photometric and spectroscopic monitoring for the ultraluminous X-ray source VII Zw…”
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Optical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449 by Ela, M Ozdogan, Akyuz, A, Aksaker, N, Avdan, S, Oralhan, I Akkaya, Vinokurov, A, Allak, S, Solovyeva, Y, Atapin, K, Bizyaev, D

“…ABSTRACT We present the results of a search for optical candidates of ultraluminous X-ray sources (ULXs) in two dwarf galaxies, NGC 4861 and NGC 4449, using…”
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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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Nature of the Emission Spectrum of NGC 7793 P13: Modeling the Atmosphere of the Donor Star by Vinokurov, A. S., Kostenkov, A. E., Atapin, K. E., Solovyeva, Yu. N.

“…We continue to study the ultra-luminous X-ray source NGC 7793 P13 in the optical range. In this work, we are testing the model of a spherically symmetric wind…”
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X-ray variability of SS 433: Evidence for supercritical accretion by Atapin, K. E., Fabrika, S. N.

“…We study the X-ray variability of SS 433 based on data from the ASCA observatory and the MAXI and RXTE/ASM monitoring missions. Based on the ASCA data, we have…”
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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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Modeling of Extended Atmospheres with Temperatures below 40000 K by Kostenkov, A., Vinokurov, A., Solovyeva, Y., Atapin, K., Fabrika, S.

“…We calculate models of extended stellar atmospheres with a temperature in the range of 12 000–40 000 K and a mass loss rate of – . A large number of objects…”
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Ultra-luminous X-ray sources as supercritical accretion disks: Spectral energy distributions by Vinokurov, A., Fabrika, S., Atapin, K.

“…We describe a model of spectral energy distribution in supercritical accretion disks (SCAD) based on the conception by Shakura and Sunyaev. We apply this model…”
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The Post-AGB Star IRAS 07253–2001: Pulsations, Long-Term Brightness Variability and Spectral Peculiarities by Ikonnikova, N. P., Burlak, M. A., Dodin, A. V., Belinski, A. A., Tatarnikov, A. M., Maslennikova, N. A., Zheltoukhov, S. G., Atapin, K. E.

“…The observations and comprehensive study of intermediate initial mass stars at the late stages of evolution, and after the asymptotic giant branch (AGB) in…”
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Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy by Khorunzhev, G. A., Sazonov, S. Yu, Medvedev, P. S., Gilfanov, M. R., Atapin, K. E., Belinski, A. A., Vozyakova, O. V., Dodin, A. V., Safonov, B. S., Tatarnikov, A. M., Bikmaev, I. F., Burenin, R. A., Dodonov, S. N., Eselevich, M. V., Zaznobin, I. A., Krivonos, R. A., Uklein, R. I., Postnov, K. A., Sunyaev, R. A.

“…The four completed six-month sky surveys with the eROSITA telescope onboard the SRG orbital observatory allow tidal disruption events (TDEs) in galactic nuclei…”
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Simultaneous X-ray/UV Observations of Ultraluminous X-ray Source Holmberg II X-1 with Indian Space Mission Astrosat by Vinokurov, A., Atapin, K., Bordoloi, O. P., Sarkisyan, A., Kashyap, U., Chakraborty, M., Rahna, P. T., Kostenkov, A., Solovyeva, Y., Fabrika, S., Safonova, M., Gogoi, R., Sutaria, F., Murthy, J.

“…We present the results of eight epochs of simultaneous UV and X-ray observations of the highly variable ultraluminous X-ray source (ULX) Holmberg II X-1 with…”
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Optical Spectroscopy of SRG/eROSITA Objects with 2.5-m Telescope at the Caucasus Mountain Observatory of the SAI MSU by Dodin, A. V., Potanin, S. A., Shatsky, N. I., Belinski, A. A., Atapin, K. E., Burlak, M. A., Egorov, O. V., Tatarnikov, A. M., Postnov, K. A., Belvedersky, M. I., Burenin, R. A., Gilfanov, M. R., Medvedev, P. S., Meshcheryakov, A. V., Sazonov, S. Yu, Khorunzhev, G. A., Sunyaev, R. A.

“…Based on observations with the new transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have…”
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Optical Spectroscopy of Quasars Discovered by SRG/eROSITA with a 2.5-m Telescope at the Caucasus Mountain Observatory of SAI MSU by Dodin, A. V., Shatsky, N. I., Belinski, A. A., Atapin, K. E., Burlak, M. A., Zheltoukhov, S. G., Tatarnikov, A. M., Postnov, K. A., Cherepashchuk, A. M., Belvedersky, M. I., Borisov, V. D., Burenin, R. A., Gilfanov, M. R., Krivonos, R. A., Medvedev, P. S., Meshcheryakov, A. V., Sazonov, S. Yu, Sunyaev, R. A., Khorunzhev, G. A.

“…Based on observations with the transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have…”
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