The Polarization and Magnetic Field of REJ1938-461 during its Low State

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion, Accretion Discs - Binaries: Close - Stars: Individual: Rej1938-461 - Stars: Magnetic Fields - Novae, Cataclysmic Variables

Scientific paper

We present intensity, polarization and spectropolarimetric data on the newly discovered AM Herculis system REJ1938-461 during a low state of activity. REJ1938-461 was found by the ROSAT all-sky survey of extreme-ultraviolet sources. Its period of 2.33 h places it in the middle of the usual 2-3 h period gap for cataclysmic variables. The spectrum of REJ1938-461 is strongly modulated in frequency, showing the presence of two dominant cyclotron humps indicative of a magnetic field of 56 MG at one of the poles on the white dwarf surface.

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