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Runaway thermonuclear burning of a layer of accumulated fuel on the surfaceof a compact star provides a brief but intense display of stellar nuclearprocesses. For neutron stars accreting from a binary companion, these eventsmanifest as thermonuclear (type-I) X-ray bursts, and recur on typicaltimescales of hours to days. We measured the burst rate as a function ofaccretion rate, from seven neutron stars with known spin rates, using a burstsample accumulated over several decades. At the highest accretion rates, theburst rate is lower for faster spinning stars. The observations imply that fast(> 400 Hz) rotation encourages stabilization of nuclear burning, suggesting adynamical dependence of nuclear ignition on the spin rate. This dependence isunexpected, because faster rotation entails less shear between the surroundingaccretion disk and the star. Large-scale circulation in the fuel layer, leadingto enhanced mixing of the burst ashes into the fuel layer, may explain thisbehavior; further numerical simulations are required to confirm.

The Influence of Stellar Spin on Ignition of Thermonuclear Runaways