Spin-modulated radiation of intermediate polars. II. Optical light curves and Hβ line profiles.

Details Spin-modulated radiation of intermediate polars. II. Optical light curves and Hβ line profiles. Spin-modulated radiation of intermediate polars. II. Optical light curves and Hβ line profiles.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..824k&link_type=abstract

Astronomy and Astrophysics, v.307, p.824-828

Astronomy and Astrophysics

Astrophysics

12

Cataclysmic Variables, Accretion, X-Rays: Stars, Line: Profiles

Scientific paper

We have extended our phenomenological model for the accretion onto magnetic white dwarfs in intermediate polars (Kim and Beuermann 1995) to calculate the optical spectrum originating from reprocessing of X-rays in the accretion funnel. Our results show that the optical continuum forms in the inner optically thick parts of the stream whereas the outer optically thinner parts dominate the line emission. The continuum flux and the line profiles both vary at the spin period. Optical and X-ray maxima occur at the same spin phase, in agreement with observation. The calculated Hβ line profiles display a complicated structure which depends on model parameters in a different way than the X-ray flux and optical continuum. For certain parameter values, we find the Hβ profile to display a double peak structure which suggests that such structure may not be a unique diagnostic for the existence of a disk. The orbital variation of the violet/red ratio of the fractional Hβ fluxes is sensitive to the inclination of the system. The initial comparisons with observations suggest that more detailed calculations may indeed yield applicable diagnostic tools.

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