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  1. No Access

    Article

    Optical and Radio Variability of the Blazar S4 0954+658

    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 and AS-500/2 0.5-m telescopes in 2003–2023, with ...

    V. V. Vlasyuk, Yu. V. Sotnikova, A. E. Volvach, O. I. Spiridonova… in Astrophysical Bulletin (2023)

  2. No Access

    Article

    Eight Exoplanet Candidates in SAO Survey

    We report eight new exoplanet candidates discovered at the Special Astrophysical Observatory of the Russian Academy of Sciences using the transit technique. Photometric observations were performed with a 50-cm...

    O. Ya. Yakovlev, A. F. Valeev, G. G. Valyavin, A. V. Tavrov… in Astrophysical Bulletin (2023)

  3. No Access

    Article

    Studies of Features of Evolution of Highly Magnetized White Dwarfs and Some Other Stars under Conditions of Magnetically Induced Suppression of Convective Energy Removal. II. Modeling

    We present a study of the influence of magnetically induced control of external convection in stars of different types, in particular white dwarfs, on their thermal evolution. In the work preceding this study,...

    V. N. Aitov, G. G. Valyavin, A. F. Valeev, G. A. Galazutdinov… in Astrophysical Bulletin (2022)

  4. No Access

    Article

    Studies of Features of Evolution of Highly Magnetized Stars—White Dwarfs. I. Observations

    We present the results of observations within the program for the search for new highly magnetized white dwarfs among evolutionary old stars of this class. The program was carried out for two years at the 1-m ...

    V. N. Aitov, G. G. Valyavin, A. F. Valeev, G. Sh. Mitiani… in Astrophysical Bulletin (2022)

  5. No Access

    Article

    On the Possibility of Using Mid-Band Filters to Search for Polar Candidates

    Abstract—This paper presents a method for searching for polar candidates using mid-band filters. One of the spectral features of polars is the HeII λ4686 strong emission line. We selected the Edmund Optics color ...

    M. M. Gabdeev, T. A. Fatkhullin, N. V. Borisov in Astrophysical Bulletin (2020)

  6. No Access

    Article

    Results of the First Year of the 3BS Polar Search Program

    We present the results of the first year of searching for polar candidates within the 3BS (3-Band Survey) program using medium-band filters. Observational data for 84 selected objects from the catalog of catac...

    M. M. Gabdeev, T. A. Fatkhullin, N. V. Borisov, V. V. Shimansky… in Astronomy Letters (2020)

  7. No Access

    Article

    Search for and Study of Photometric Variability of Magnetic White Dwarfs WD 2047+372 and WD 0009+501

    We report the results of long-term photometric observations of the magnetic white dwarfs WD 2047+372 and WD 0009+501, aimed to search for and study regular brightness variability in these stars. The data in the V

    K. A. Antonyuk, G. G. Valyavin, A. F. Valeev, S. V. Karpov… in Astrophysical Bulletin (2019)

  8. No Access

    Article

    Exoplanet Studies. Photometric Analysis of the Transmission Spectra of Selected Exoplanets

    We present the results of ground based observations and model analysis of transits of exoplanets WASP-33b, WASP-43b, WASP-104b, and HD 219134b. Broadband transmission spectra (dependence of the observed radii ...

    G. G. Valyavin, D. R. Gadelshin, A. F. Valeev, T. E. Burlakova… in Astrophysical Bulletin (2018)

  9. No Access

    Article

    Mathematical model of orbital and ground-based cross-dispersion spectrographs

    We present the technique and algorithm of numerical modeling of high-resolution spectroscopic equipment. The software is implemented in C++ using nVidia CUDA technology. We report the results of currently deve...

    M. V. Yushkin, T. A. Fatkhullin, V. E. Panchuk in Astrophysical Bulletin (2016)

  10. No Access

    Article

    Photometry and spectroscopy of the luminous red nova PSNJ14021678+5426205 in the galaxy M101

    We present the results of the study of a red nova from the observations carried out with the Russian 6-m telescope (BTA) along with other telescopes of SAO RAS and SAI MSU. To investigate the nova progenitor,w...

    V. P. Goranskij, E. A. Barsukova, O. I. Spiridonova, A. F. Valeev… in Astrophysical Bulletin (2016)

  11. No Access

    Article

    Detection of regular low-amplitude photometric variability of the magnetic dwarf WD0009+501. on the possibility of photometric investigation of exoplanets on the basis of 1-meter class telescopes of the special and crimean astrophysical observatories

    We present the results of photometric observations of the weak magnetic white dwarf WD 0009+501. The observations were carried out for two years with the 1-m telescopes of the Special and Crimean Astrophysical...

    A. F. Valeev, K. A. Antonyuk, N. V. Pit, V. Ya. Solovyev… in Astrophysical Bulletin (2015)

  12. No Access

    Article

    The MASTER-II network of robotic optical telescopes. First results

    The main stages in the creation of the Russian segment of the MASTER network of robotic telescopes is described. This network is designed for studies of the prompt optical emission of gammaray bursts (GRBs; op...

    E. S. Gorbovskoy, V. M. Lipunov, V. G. Kornilov, A. A. Belinski… in Astronomy Reports (2013)

  13. No Access

    Article

    Study of faint galaxies in the field of GRB021004

    We present an analysis of BV R c I c observations of the field sized...

    Yu. V. Baryshev, I. V. Sokolov, A. S. Moskvitin, T. A. Fatkhullin… in Astrophysical Bulletin (2010)

  14. No Access

    Article

    Spectroscopy of “Big Trio” objects using the “Scorpio” spectrograph of the 6-m telescope of the Special Astrophysical Observatory

    We present the results of spectroscopy of 71 objects with steep and ultra-steep spectra (α < −0.9, S ∝ ν α) from the “Big Trio” (RATAN-600-VLA-BTA) project, performed with the “Scorpio” sp...

    Yu. N. Parijskij, A. I. Kopylov, A. V. Temirova, N. S. Soboleva… in Astronomy Reports (2010)

  15. No Access

    Article

    Spectral and photometric monitoring of distant core-collapse supernovae in the SAO RAS

    This paper describes the aims, objectives and first results of the observational program for the study of distant core-collapse supernovae (SNe) with redshifts z ≲ 0.3. This work is done within the framework of a...

    A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, V. N. Komarova… in Astrophysical Bulletin (2010)

  16. No Access

    Article

    Study of envelope velocity evolution of core-collapse type Ib-c supernovae from observations of XRF 080109 / SN 2008D and GRB 060218 / SN 2006aj with BTA

    Results of modeling the spectra of two supernovae SN2008D and SN2006aj related to the X-ray flash XRF 080109 and gamma-ray burst GRB/XRF 060218, respectively, are studied. The spectra were obtained with the 6-...

    A. S. Moskvitin, E. Sonbas, V. V. Sokolov, T. A. Fatkhullin… in Astrophysical Bulletin (2010)

  17. No Access

    Chapter and Conference Paper

    SWIFT J195509+261406: Dramatic Flaring Activity from a New Galactic Magnetar

    Most of the transient sources that are detected in the gamma-ray sky are produced by extragalactic gamma-ray bursts (GRBs). However, it is known that there are some other astronomical objects that can produce ...

    A. de Ugarte Postigo, A. J. Castro-Tirado… in Highlights of Spanish Astrophysics V (2010)

  18. No Access

    Article

    A γ-ray burst at a redshift of z ≈ 8.2

    Two groups present redshift determinations and other spectroscopic data for the γ-ray burst GRB 090423 — now the earliest and most distant astronomical object known. Salvaterra et al. report its initial detection...

    N. R. Tanvir, D. B. Fox, A. J. Levan, E. Berger, K. Wiersema, J. P. U. Fynbo… in Nature (2009)

  19. No Access

    Article

    Flares from a candidate Galactic magnetar suggest a missing link to dim isolated neutron stars

    Two groups report the observation of optical flares from SWIFT J195509.6+261406, an intriguing X-ray source located in our Galaxy and initially discovered as a γ-ray burst by the orbiting Swift observatory. St...

    A. J. Castro-Tirado, A. de Ugarte Postigo, J. Gorosabel, M. Jelínek… in Nature (2008)

  20. No Access

    Article

    Stellar-wind envelope around the massive supernova progenitor XRF/GRB 060218/SN 2006aj

    The spectra of the supernova SN 2006aj identified with the X-ray flash (XRF) and gammaray burst XRF/GRB 060218/SN 2006aj taken with the 6-m telescope of the Special Astrophysical Observatory of the Russian Aca...

    E. Sonbas, A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov… in Astrophysical Bulletin (2008)

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