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Nature of the Eclipsing Polar 1RXS J184542.4\(+\)483134

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Abstract

We have carried out a comprehensive study of the poorly investigated eclipsing polar 1RXS J184542.4\(+\)483134 with a short orbital period \(P_{\textrm{orb}}\approx 79\) min. An analysis of its long-term light curves points to a change in the position and sizes of the accretion spot as the accretion rate changes. Narrow and broad components, which are probably formed on the ballistic segment of the accretion stream and on the magnetic trajectory, respectively, are identified in the emission line profiles. An inversion of the line profiles from emission to absorption due to the obscuration of the accretion spot by the accretion stream is observed. Based on the eclipse duration and the radial velocities of the narrow line component, we impose constraints on the white dwarf mass, \(0.49\leq M_{1}/\;M_{\odot}\leq 0.89\), and the orbital inclination, \(79.7^{\circ}\leq i\leq 84.3^{\circ}\). An analysis of the cyclotron spectra points to the presence of two accretion spots with magnetic field strengths \(B_{1}=28.4^{+0.1}_{-0.2}\) MG and \(B_{2}=30{-}36\) MG. The main spot has a complex structure that apparently has a dense core and a less dense periphery emitting a spectrum with cyclotron harmonics. Polarization observations reveal a circular polarization sign reversal during the orbital period and an anticorrelation of the polarization with the brightness of the polar. Our modeling of polarization observations using the simple model of an accreting white dwarf shows that the polarization properties can be interpreted in terms of two-pole accretion with different optical depths of the accretion spots (\(\tau_{1}/\tau_{2}\sim 10\)). An analysis of the Swift/XRT observations points to a predominance of bremsstrahlung in the X-ray radiation from the system.

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Notes

  1. For more details on the SCORPIO-2 focal reducer, see https://www.sao.ru/hq/lsfvo/devices/scorpio-2/index.html.

  2. For more details on the SCORPIO focal reducer, see https://www.sao.ru/hq/lsfvo/devices/scorpio/scorpio.html.

  3. The IRAF astronomical data processing and analysis package was developed by the National Optical Astronomy Observatory (USA) and is accessible at https://iraf-community.github.io.

  4. The Swift/XRT observational data extraction service is accessible at https://www.swift.ac.uk/user_objects/.

  5. The HEASoft software package is accessible at https://heasarc.gsfc.nasa.gov/lheasoft/.

  6. The service on determining the interstellar extinction from the maps by Schlafly and Finkbeiner (2011) is accessible at https://irsa.ipac.caltech.edu/applications/DUST/.

  7. The service for work with the 3D interstellar extinction maps by Lallement et al. (2014) is accessible at https://stilism.obspm.fr/.

  8. The service for work with the 3D interstellar extinction maps by Green et al. (2019) is accessible at http://argonaut.skymaps.info/.

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ACKNOWLEDGMENTS

We are grateful to TÜBİTAK, the Space Research Institute of the Russian Academy of Sciences, the Kazan Federal University, and the Academy of Sciences of Tatarstan for their partial support in using RTT-150 (the Russian–Turkish 1.5-m telescope in Antalya).

Funding

This study was supported by the Russian Science Foundation (project no. 22-72-10064). The observations with the telescopes at the Special Astrophysical Observatory of the Russian Academy of Sciences are supported by the Ministry of Science and Higher Education of the Russian Federation. The instrumentation is updated within the ’’Science and universities’’ National Project.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

    V. Yu. Kochkina, A. I. Kolbin & N. V. Borisov

  2. Kazan (Volga Region) Federal University, 420000, Kazan, Russia

    V. Yu. Kochkina, A. I. Kolbin & I. F. Bikmaev

  3. North-Caucasus Federal University, 355017, Stavropol, Russia

    A. I. Kolbin

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  1. V. Yu. Kochkina
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  4. I. F. Bikmaev
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Correspondence to V. Yu. Kochkina or A. I. Kolbin.

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Translated by V. Astakhov

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Kochkina, V.Y., Kolbin, A.I., Borisov, N.V. et al. Nature of the Eclipsing Polar 1RXS J184542.4\(+\)483134. Astron. Lett. 49, 706–721 (2023). https://doi.org/10.1134/S1063773723110051

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