A5032000020- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Optical Systems and Laser Technology
- Advanced Measurement and Metrology Techniques
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Galaxies: Formation, Evolution, Phenomena
- Rare-earth and actinide compounds
- Astrophysics and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Infrared Target Detection Methodologies
Kazan Federal University
2013-2024
Special Astrophysical Observatory
2020-2024
North-Caucasus Federal University
2023
The spectral and photometric studies of the cataclysmic variable Gaia 19cwm (or ZTF19aamkwxk) have been performed. Based on analysis long-term variability, it is concluded that object belongs to WZ Sge type stars. light curves show eclipses recurring with an orbital period $86.32048 \pm 0.00005$ min, as well out-of-eclipse variability a $\approx 6.45$ min. latter stable for $\sim 4$ years appears correspond rotation magnetic white dwarf, i.e., intermediate polar. spectra photospheric lines...
Context. The paper is comprised of optical identification and multiwavelength studies a new X-ray source discovered by the Spectrum Roentgen-Gamma (SRG) observatory during ART-XC survey its follow-up observations. Aims. We aim to identify SRGA J213151.5+491400 in wavelengths. determine spectra light curves high low states find periodicities resolve emission lines system using ground-based data. intend study spectral temporal characteristics SRG surveys NICER data state. Methods. present from...
We analyze spectroscopic and photometric observations of the eclipsing polar BS Tri. The polar's light curve shape variations can be interpreted by changing contributions accretion stream to integral radiation system. Based on radial velocity curves irradiated part secondary, we refine masses system components, $M_1 = 0.60 \pm 0.04 M_{\odot}$, $M_2 \approx 0.12 orbital inclination, $i=85\pm 0.5^{\circ}$. spectra reveal cyclotron harmonics forming in an spot with a magnetic field strength...
Выполнены спектральное и фотометрическое исследования слабоизученного поляра BM CrB. На основе данных обзора ZTF выявлено три состояния блеска признаки перехода от однополюсного к двухполюсному режиму аккреции при увеличении среднего системы. Показано, что переходе низкого высокому происходит изменение долготы главного аккреционного пятна (на \({\approx}17^{\circ}\) ) увеличение его протяженности \({\approx}10^{\circ}\) ). В спектрах присутствуют зеемановские абсорбции линии H \(\alpha\) ,...
We report results of optical identification and multi-wavelength study a new polar-type magnetic cataclysmic variable (MCV), SRGA J213151.5+491400, discovered by Spectrum Roentgen-Gamma ($SRG$) observatory in the course all-sky survey. present data from telescopes Turkey (RTT-150 T100 at T\"UBITAK National Observatory), Russia (6-m 1-m SAO RAS), together with X-ray obtained $ART-XC$ $eROSITA$ aboard $SRG$ $NICER$ observatory. detect J213151.5+491400 high state 2020 (17.9 mag) that decreases...
SRGe J194401.8+284452 is the brightest point-like X-ray object within position uncertainty ellipse of an unidentified $\gamma$-ray source 4FGL J1943.9+2841. We performed multi-wavelength spectral and photometric studies to determine its nature possible association with source. firmly established optical counterpart Gaia based distance about 415 pc. Our data show that a cataclysmic variable orbital period 1.5 hours, late type donor star accretion disk around white dwarf. exhibits fast...
We present the results of optical study new eclipsing polar Gaia23cer. analyzed brightness variability in high ($\langle r \rangle \approx 16.5\mathrm{\,mag}$) and low 19.2\mathrm{\,mag}$) states. The system has an orbital period $P_{orb} = 102.0665 \pm 0.0015$ min exhibits deep eclipses with a duration $\Delta t_{ecl} 401.30 0.81$ s. spectra have red cyclotron continuum Zeeman H$\alpha$ absorption triplet forming magnetic field strength $15.2 1.1$ MG. source emission lines radial velocity...
ABSTRACT About 200 echelle spectra, obtained at the 1-m and 6-m telescopes of Special Astrophysical Observatory (SAO) Russian Academy Sciences (RAS), with high spectral resolution signal-to-noise ratio, were used to investigate radial velocity variability time in both components θ1 Ori C binary system during its periastron passage. The quality our spectra have allowed us find a methodical approach for spectroscopic study orbital motions select lines suitable this goal. analysis has shown...