Optical Study of the Polar BM CrB in a Low State

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We have performed spectroscopic and photometric studies of the poorly explored polar BM CrB. Based on ZTF survey data, we have revealed three brightness states of the polar and evidence of the transition from one-pole to two-pole accretion as the average brightness of the system increases. We show that there are a change in the longitude of the main accretion spot (by @17) and an increase in its extent (by@10) when passing from the low state to the high one. Zeeman Ha absorptions formed in a magnetic field of strength B = 15.5+1  MG are present in the spectra. The cool halo extending from the accretion spot to @1/4  of the white dwarf radius can be the source of these absorptions. Our modeling of the behavior of the Ha emission line shows that the main source of the emission is the segment of the accretion stream near the Lagrange point L1 that is periodically eclipsed by the donor star. The spectra exhibit a cyclotron component forming in the accretion spot. Their modeling by a simple accretion spot model gives constraints on the magnetic field strength, B = 15–40 MG, and the temperature, Te@15 keV.

作者简介

A. Kolbin

Special Astrophysical Observatory, Russian Academy of Sciences; Kazan (Volga Region) Federal University

Email: kolbinalexander@mail.ru
357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia; 420000, Kazan, Russi

N. Borisov

Special Astrophysical Observatory, Russian Academy of Sciences

Email: kolbinalexander@mail.ru
357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

A. Burenkov

Special Astrophysical Observatory, Russian Academy of Sciences

Email: kolbinalexander@mail.ru
357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

O. Spiridonova

Special Astrophysical Observatory, Russian Academy of Sciences

Email: kolbinalexander@mail.ru
357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

I. Bikmaev

Kazan (Volga Region) Federal University; Academy of Sciences of Tatarstan

Email: kolbinalexander@mail.ru
Россия, Казань; Россия, Казань

M. Suslikov

Special Astrophysical Observatory, Russian Academy of Sciences; Kazan (Volga Region) Federal University

编辑信件的主要联系方式.
Email: kolbinalexander@mail.ru
357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia; 420000, Kazan, Russi

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