H_gamma Line Spectrum of Intermediate Polars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Kim & Beuermann (1995, 1996) have developed a model for the propagation of X-rays from the accreting white dwarf through the infalling material and the re-emission of the energy deposited by photo-absorption in the optical (and UV) spectral range. By using this model, we calculate the profiles of the H_gamma emission-line spectrum of intermediate polars. Photoabsorption of X-rays by the infalling material is the dominant process in forming the observed energy-dependent rotational modulation of the X-ray flux. X-ray and optical modulations are sensitive to model parameters in different ways. In principle, these dependencies allow us to obtain improved insight into the accretion geometry of the intermediate polars. We present results of our calculations and compare them with the H_beta line spectrum (Kim & Beuermann 1996).

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