Hot spiral structure in the accretion disk of the dwarf nova IP Pegasi

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion And Accretion Disks, Cataclysmic Binaries, Symbiotic Stars, Visible

Scientific paper

We present observational evidence of high-temperature spiral structure on the accretion disk of the dwarf nova IP Peg during outburst. The Doppler tomogram of ionized helium He II 4686 shows a two-arm spiral pattern on the disk image. The spiral shocks are generated by the tides raised by the secondary star on the disk and shows that a new mechanism may be important in transporting angular momentum out of the disk in addition to viscosity.

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