SDSS J085414.02+390537.3—A New Asynchronous Polar

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Resumo

Based on data from the ZTF photometric survey, we have revealed asynchrony of the polar SDSS J085414.02+390537.3. A beat period Pbead=24,6+0,1 days, during which the system changes its brightness by =3m, is distinguished in the light curves. Power peaks at the white-dwarf rotation period Pspin=113.197+0,001 min and orbital period Porb=113,56+0,001 min are revealed in the periodograms, with the corresponding polar asynchrony being 1-Porb/Pspin=0,3%. The photometric behavior of the polar points to a change of the main accreting pole during the beat period. Based on the Zeeman splitting of the Hb line, we have estimated the mean magnetic field strength of the white dwarf to be B=28,5+1,5 MG. The magnetic field strength near the magnetic pole has been found by modeling the cyclotron spectra to be B=34+2 MG. The Doppler tomograms in the Hb line exhibit a distribution of emission sources typical for polars in velocity space with evidence of the transition of the accretion stream from the ballistic trajectory to the magnetic one.

Sobre autores

A. Kolbin

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia; Kazan (Volga Region) Federal University, 420000, Kazan, Russia; North-Caucasus Federal University, 355017, Stavropol, Russia

Email: kolbinalexander@mail.ru
Россия, Нижний Архыз; Россия, Казань; Россия, Ставрополь

M. Suslikov

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia; Kazan (Volga Region) Federal University, 420000, Kazan, Russia

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

V. Kochkina

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia; Kazan (Volga Region) Federal University, 420000, Kazan, Russia

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

N. Борисов

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

Email: kolbinalexander@mail.ru
Россия, Нижний Архыз

A. Burenkov

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

Email: kolbinalexander@mail.ru
Россия, Нижний Архыз

D. Oparin

Special Astrophysical Observatory, Russian Academy of Sciences, 357147, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

Autor responsável pela correspondência
Email: kolbinalexander@mail.ru
Россия, Нижний Архыз

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