Irradiation of the companion star in cataclysmic variables

Statistics – Computation

Scientific paper

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Cataclysmic Variables, Companion Stars, Irradiation, Stellar Mass Accretion, White Dwarf Stars, Accretion Disks, Computational Astrophysics, Dwarf Novae, Photosphere, Stellar Luminosity

Scientific paper

Radiation from the accretion flow at the white dwarf is shown being unable to penetrate to the photosphere of the companion star in cataclysmic binaries. The radiation may in some cases ionize the subsonic accretion flow just below the inner Lagrange point. This probably holds for AM Her systems and in some dwarf nova outbursts, and may cause long-term luminosity variations such as low states and possibly superoutbursts. If irradiation is effective, the ionization front near L(1) must oscillate. This causes variations of the order of about 10 percent in the mass transfer rate on the dynamical time-scale, i.e. about 5 percent of the binary period.

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