A 56 MG field at the second pole in VV Puppis

Astronomy and Astrophysics – Astrophysics

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Cyclotron Radiation, Magnetic Stars, Polarimetry, Variable Stars, White Dwarf Stars, X Ray Binaries, Axes Of Rotation, Stellar Rotation

Scientific paper

Phase-dependent spectropolarimetric observations of VV Puppis are presented, which show cyclotron lines from both poles. The main and secondary emission regions have fields of 30.5 MG and 56 MG, respectively. The second pole is visible at all phases and is located within 10 deg of the rotation axis of the white dwarf. The observations can be interpreted in terms of a dipole which is offset by about 0.1 R(wd) from the center of the white dwarf in the direction of the dipole axis with the emission regions located near the foot points of closed field lines.

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