Accretion belts on white dwarfs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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97

Novae, Stellar Mass Accretion, Stellar Models, White Dwarf Stars, Astronomical Models, Stellar Luminosity, Stellar Rotation

Scientific paper

Matter which falls onto a slowly rotating white dwarf from an accretion disk forms a rapidly rotating belt whose chemical composition and angular momentum are mixed with the surrounding white-dwarf material by shear instabilities. The structure and evolution of accretion belts are computed in a simplified model. After a sufficient amount of material is accreted, hydrogen is ignited at the bottom of the belt. The model presented differs drastically from the models of spherically symmetric accretion on which current nova theories are based.

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