Cyclotron and Zeeman spectroscopy of V834 Centauri

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Cyclotron Radiation, Stellar Mass Accretion, Stellar Spectrophotometry, White Dwarf Stars, Zeeman Effect, Absorption Spectra, Emission Spectra, Light Curve, Red Shift, Stellar Magnetic Fields

Scientific paper

Phase-resolved low-resolution spectrophotometry of the AM Herculis binary V834 Cen in a high state of accretion reveals broad emission and absorption features produced by the strong magnetic field. Careful treatment of the data is used to disentangle cyclotron line emission and Zeeman absorption and to determine the corresponding phase dependencies. An improved method for the application of cyclotron models to observational data allows the magnetic field strength, the plasma temperature, the orbital inclination, and the inclination of accreting magnetic field lines to be determined. The absorption lines appear redshifted when observed down the accretion funnel, indicating that they arise in cool free-falling matter. The field strength derived from cyclotron and Zeeman features shows that the absorbing cool gas is located very close to the emitting hot plasma.

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