Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation

Бисикало, Д. В.; Sobolev, A. V.; Жилкин, А. Г.

doi:10.3390/galaxies9040110

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…In our previous work [Bisikalo (2021)] we already investigated the movement of hot spots in synchronous and asynchronous polars. The three-dimensional pictures of the flow structure constrained by the results of numerical calculations and maps of the temperature distribution over the accretor surface together provide quantitative estimates of the hot spots movement.…”

Section: Introductionmentioning

confidence: 99%

Hot spot drift in synchronous and asynchronous polars: synthesis of light curves

Sobolev¹,

Бисикало²,

Жилкин³

2020

Proc. IAU

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In this paper, the effect of hot spots movement by accretor surface on the appearance of bolometric light curves for two types of polars - synchronous V808 Aur and asynchronous CD Ind is studied. The analysis was carried out under the assumption of a dipole configuration of the magnetic field, in which the axis of the dipole passes through the accretor center. It is shown that a noticeable shift of the flow maximum at the light curve corresponding to the position of the spots in synchronous polars is determined by a change in the magnitude of mass transfer rate. At the same time, the maximum deviation of the spots from the magnetic poles was 30°. In asynchronous polars, assuming a constant of the mass transfer rate, the spots movement caused by a change in the orientation of the dipole axis relative to the donor has a significant effect on the appearance of light curve. The greatest displacement of the spots from the magnetic poles, which equals to 20°, was observed at the moments when the accretion jet switched from one pole to the other. It is concluded that the comparison of synthetic and observational light curves provides an opportunity to study the physical properties of polars.

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Section: Introductionmentioning

confidence: 99%

Hot spot drift in synchronous and asynchronous polars: synthesis of light curves

Sobolev¹,

Бисикало²,

Жилкин³

2020

Proc. IAU

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Optical identification and follow-up observations of SRGA J213151.5+491400

Balman,

Khamitov,

Kolbin

et al. 2024

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The paper is comprised of optical identification and multiwavelength studies of a new X-ray source discovered by the Spectrum Roentgen-Gamma ( observatory during the survey and its follow-up optical and X-ray observations. We aim to identify SRGA\,J213151.5+491400 in the optical wavelengths. We determine spectra and light curves in the optical high and low states to find periodicities in the light curves and resolve emission lines in the system using optical ground-based data. We intend to study the spectral and temporal X-ray characteristics of the new source using the surveys in the high and low states and data in the low state. I TAK National Observatory) and in Russia (6-m and 1-m at SAO RAS), together with the X-ray data obtained with and telescopes aboard and the observatory. Using the optical data, we performed astrometry, photometry, spectroscopy, and power spectral analysis of the optical time series. We present optical Doppler tomography along with X-ray data analysis producing light curves and spectra. We detected in a high state in 2020 (17.9 mag) that decreased by about 3 mag into a low state (21 mag) in 2021. We find only one significant period using optical photometric time series analysis, which reveals the white dwarf spin (orbital) period to be 0.059710(1) days (85.982 min). The long slit spectroscopy in the high state yields a power-law continuum increasing towards the blue with a prominent II line along with the Balmer line emissions with no cyclotron humps, which is consistent with a magnetic cataclysmic variable (MCV) nature. Doppler Tomography confirms the polar nature revealing ballistic stream accretion along with magnetic stream during the high state. These characteristics show that the new source is a polar-type MCV source. detections yield an X-ray flux of (4.0-7.0)times in the high state. detects a dominating hot plasma component max $ $>$ 21 keV in the high state) declining to (4.0-6.0)times 10$^ in 2021 (low state). The data obtained in the low state reveal a two-pole accretor showing a soft X-ray component at (6-7)sigma significance with a blackbody temperature of 15-18 eV. A soft X-ray component has never been detected for a polar in the low state before.

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Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation

Cited by 2 publications

References 54 publications

Hot spot drift in synchronous and asynchronous polars: synthesis of light curves

Hot spot drift in synchronous and asynchronous polars: synthesis of light curves

Optical identification and follow-up observations of SRGA J213151.5+491400

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