Bursts with rapid flux fluctuations show X-ray reflection from an inner, warped accretion disk, while most non-fluctuating bursts show only a blackbody; this supports a radiation-driven warp instability and implies high disk viscosity.
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Do Accretion Disks Get Bent Out of Shape? Investigating the Origin of Rapid Fluctuations in the Tails of Long Thermonuclear X-ray Bursts
Bursts with rapid flux fluctuations show X-ray reflection from an inner, warped accretion disk, while most non-fluctuating bursts show only a blackbody; this supports a radiation-driven warp instability and implies high disk viscosity.