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  1. Article

    Open Access

    Distribution of Cool Starspots on the Surface of the Red Dwarf V647 Her

    An analysis of photometric observations of the star V647 Her (M3.5V) obtained at the 1.25-m telescope of the Crimean Astrophysical Observatory in 2022 is presented. The presence of a low-amplitude variability ...

    N. I. Bondar’, K. A. Antonyuk, N. V. Pit, I. Yu. Alekseev in Astronomy Reports (2024)

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  2. No Access

    Article

    ASASSN-19fy: Features of a Dwarf Nova in the “Period Gap”

    Photometric studies of the dwarf nova ASASSN-19fy in the “period gap” were carried out in 2020-2021 over 24 nights at the Crimean Astrophysical Observatory of the Russian Academy of Sciences and 3 nights at th...

    O. I. Antonyuk, E. P. Pavlenko, K. A. Antonyuk, N. V. Pit, A. A. Sosnovskij… in Astrophysics (2023)

  3. No Access

    Article

    Chromatic Afterglow of GRB 200829A

    We present the results of our analysis of multiwavelength observations for the long gamma-ray burst GRB 200829A. The burst redshift $$...

    N. S. Pankov, A. S. Pozanenko, P. Yu. Minaev, S. O. Belkin… in Astronomy Letters (2023)

  4. No Access

    Article

    Periodic Variations in the Brightness of the Red Dwarf V647 Her

    Photometric series for the red dwarf V647 Her (M3.5V) obtained from observations in 2019 at the Crimean Astrophysical Observatory and from data in the SuperWASP calalog in 2004-2007 are analyzed. Analysis of t...

    N. I. Bondar, K. A. Antonyuk, N. V. Pit in Astrophysics (2022)

  5. 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)

  6. 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)

  7. No Access

    Article

    Changes in the Period of Negative Superhumps of Type SU UMa Dwarf Novae. II. NY Her (2017 and 2020)

    Photometric studies of the type SU UMa dwarf nova NY Her were made during 2017 and 2020 at the Crimean Astrophysical Observatory and at the Sanglokh Observatory over a total of 77 nights. These observations co...

    E. P. Pavlenko, A. A. Sosnovskii, K. A. Antonyuk, O. I. Antonyuk… in Astrophysics (2021)

  8. No Access

    Article

    Variations in the Period of Negative Superhumps in SU UMa-Type Dwarf Novae. I. Mn Dra (2012-2017)

    This is a photometric study of the dwarf nova MN Dra made during 2012-2017 on nine telescopes over 152 nights. Overall, the observations covered 4 superoutbursts, 7 normal outbursts and the quiescent state. Th...

    A. S. Sklyanov, E. P. Pavlenko, K. A. Antonyuk, N. V. Pit… in Astrophysics (2020)

  9. 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)

  10. No Access

    Article

    Cool Spots on the Surface of the Active Giant PZ Mon

    Based on the multicolor (BVRIJHKL) photometric observations of the active red giant PZ Mon performed for the first time in the winter season of 2017–2018, we have determined the main characteristics of the spotte...

    Yu. V. Pakhomov, V. I. Shenavrin, N. I. Bondar’, K. A. Antonyuk… in Astronomy Letters (2019)

  11. No Access

    Article

    Results of Photometric and Spectroscopic Observations of the Young Variable Star V730 Cep

    We present the results of our photometric (V RI) and spectroscopic observations of the young variable star V730 Cep (MisV1147) classified by Uemura et al. (2004) as a Herbig Be star. Our photometry confirms the c...

    V. P. Grinin, K. A. Antonyuk, I. S. Potravnov, D. Mkrtichian in Astronomy Letters (2018)

  12. 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)

  13. No Access

    Article

    NY Ser: Outburst Activity and Multiperiodic Processes in its Various Stages During 2014 and 2016

    Results from observation campaigns for the dwarf nova NY Ser during 2014 and 2016 are presented. Data were obtained on a total of 126 nights in 2014 that include 20 normal outbursts and one superoutburst and o...

    A. S. Sklyanov, E. P. Pavlenko, O. I. Antonyuk, A. A. Sosnovskij… in Astrophysics (2018)

  14. No Access

    Article

    Spotted Surface Structure of the Active Giant PZ Mon

    Based on our photometric observations in 2015–2016 and archival photometric data for the active red giant PZ Mon, we have found the main characteristics of the stellar surface: the unspotted surface temperature T

    Yu. V. Pakhomov, K. A. Antonyuk, N. I. Bondar’, N. V. Pit’, I. V. Reva… in Astronomy Letters (2018)

  15. No Access

    Article

    Photometric Period of the Star PZ Mon

    Results are presented from a search for periodic variations in the brightness and color indices of the active star PZ Mon based on many years of photometric data from 1992 to 2015. The photometric period deriv...

    K. A. Antonyuk, N. I. Bondar’, N. V. Pit’ in Astrophysics (2017)

  16. No Access

    Article

    Polarimetry of the Nova V339 Del

    Polarimetric UBVRI observations of the Nova V339 Del during the 5-108 days following the maximum of the outburst of 2013 reveal a variability in the degree of linear polarization with an amplitude of about 0.2...

    D. N. Shakhovskoy, K. A. Antonyuk, S. P. Belan in Astrophysics (2017)

  17. No Access

    Article

    Search for and study of photometric variability in magnetic white dwarfs

    We report the results of photometric observations of a number of magnetic white dwarfs in order to search for photometric variability in these stars. These V-band observations revealed significant variability in ...

    A. F. Valeev, K. A. Antonyuk, N. V. Pit, A. S. Moskvitin… in Astrophysical Bulletin (2017)

  18. No Access

    Article

    Spectroscopic observations of the exoplanet WASP-32b transit

    We present first results of spectroscopic observations of transiting exoplanets in the Special Astrophysical Observatory of the Russian Academy of Sciences with the Main Stellar Spectrograph of the 6-m BTA tel...

    A. O. Grauzhanina, G. G. Valyavin, D. R. Gadelshin… in Astrophysical Bulletin (2017)

  19. No Access

    Article

    Detection of circular polarization and low-amplitude photometric variability of the white dwarf WD1748+508

    We report the results of a polarimetric and photometric study of the cool white dwarf WD1748+508. Observations were performed during four consecutive nights on the telescopes of the Crimean Astrophysical Obser...

    K. A. Antonyuk, S. V. Kolesnikov, N. V. Pit, G. G. Valyavin… in Astrophysical Bulletin (2016)

  20. No Access

    Article

    Superhump evolution of WZ Sge-type dwarf nova ASASSN-14cv at rebrightening stage

    We report the results of observations of a WZ Sge-type dwarf nova ASASSN-14cv, acquired in 2014 and covering the end of a superoutburst and a rebrightening stage. We detected 8 rebrightenings of this star. Bas...

    A. S. Sklyanov, E. P. Pavlenko, O. I. Antonyuk, K. A. Antonyuk… in Astrophysical Bulletin (2016)

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