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  • Modeling of Extended Atmospheres with Temperatures below 40000 K 
    Kostenkov A.; Vinokurov A.; Solovyeva Y.; Atapin K.; Fabrika S. (2020)
    © 2020, Pleiades Publishing, Ltd. Abstract: 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 10-6–10-4 Mʘyr-1. A large number of objects with ...
  • New luminous blue variable candidates in NGC 4736 
    Solovyeva Y.; Vinokurov A.; Fabrika S.; Kostenkov A.; Sholukhova O.; Sarkisyan A.; Valeev A.; Atapin K.; Spiridonova O.; Moskvitin A.; Nikolaeva E. (2019)
    © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We have found three new luminous blue variable (LBV) candidates in the star-forming galaxy NGC4736. They show typical ...
  • New luminous blue variable candidates in the NGC 247 galaxy 
    Solovyeva Y.; Vinokurov A.; Sarkisyan A.; Atapin K.; Fabrika S.; Valeev A.F.; Kniazev A.; Sholukhova O.; Maslennikova O. (2020)
    © 2020 The Author(s). 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 galaxy. Object j004703.27-204708.4 (MV =-9.08 ± ...
  • Search for LBVs in the Local Volume galaxies: Study of four stars in NGC 4449 
    Solovyeva Y.; Vinokurov A.; Sarkisyan A.; Kostenkov A.; Atapin K.; Fabrika S.; Oparin D.; Valeev A.; Bizyaev D.; Nedialkov P.; Spiridonova O. (2021)
    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 spectral observations carried out for J122810.94+440540.6, J122811.70+440550.9, ...
  • Ultraluminous X-ray sources with flat-topped noise and QPO 
    Atapin K.; Fabrika S.; Caballero-García M. (2019)
    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We analysed the X-ray power density spectra of five ultraluminous X-ray sources (ULXs) NGC5408 X-1, NGC6946 X-1, M82 ...
  • X-ray variability of ss 433: Effects of the supercritical accretion disc 
    Atapin K.; Fabrika S.; Medvedev A.; Vinokurov A. (2015)
    © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We study a stochastic variability of SS 433 in the 10-4-5 × 10-2 Hz frequency range based on RXTE data, and on simultaneous ...
  • X-ray variability of SS 433: Evidence for supercritical accretion 
    Atapin K.; Fabrika S. (2016)
    © 2016, Pleiades Publishing, Inc.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 constructed the power spectrum ...

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