Absorption features from the accretion column in E1405-451

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Absorption Spectra, Binary Stars, Polarimetry, Stellar Mass Accretion, White Dwarf Stars, X Ray Spectra, Circular Polarization, Cyclotron Radiation, Magnetic Stars, Stellar Spectrophotometry, Zeeman Effect

Scientific paper

Phase-resolved circular spectropolarimetric observations of E1405-451 (V834 Cen) covering the wavelength region 3500-7800 A obtained using the Anglo-Australian Telescope are presented. The data show broad absorption features in a strongly polarized cyclotron-continuum present only near maximum light. Cyclotron harmonic and Zeeman line interpretations are investigated, and it is shown that the stronger features are consistent with a nonphotospheric Zeeman interpretation corresponding to a field range of 20-25 MG. The observations provide evidence of cool unshocked material surrounding accretion shocks in AM Herculis systems.

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