Vol 25, No 12

The Optical Study of the Eclipsing Polar SDSS J002637.06+242915.6

V. Yu. Kochkina, A. I. Kolbin, T. A. Fatkhullin, A. S. Vinokurov and N. V. Borisov

Abstract

We have analyzed phase-resolved photometric and spectroscopic observations of the eclipsing polar SDSS J002637.06+242915.6. The light curve has a M-shaped bright phase that was reproduced using a simple model of an accreting magnetic white dwarf. The hydrogen emission lines exhibit a narrow component formed on the irradiated hemisphere of the donor. The Doppler tomography revealed differences in the positions of emission regions of hydrogen and He IIλ4686 lines. The spectra exhibit a Zeeman absorption triplet of the Hα line, formed in the cold halo around the accretion spot at a magnetic field strength of B = 15.1 ± 1.3 MG. The spectra of the bright phase have a red cyclotron continuum, whose orbital variability has been interpreted within a simple model of an accretion spot. The modeling of the cyclotron continuum constrains the white dwarf’s magnetic field to Bcyc ≲ 45 MG. The analysis of the eclipse light curve and the radial velocities of the irradiated hemisphere yielded estimates for the orbital inclination 77.°2 ≤ i ≤ 80.°6, the mass ratio 0.23 ≤ q ≤ 0.43, and the white dwarf mass 0.72 ≥ M1/M ≥ 0.42.


Keywords

(stars:) novae, cataclysmic variables– stars: magnetic field– techniques: photometric– techniques: spectroscopic– stars: individual (SDSS J002637.06+242915.6)

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