The importance of 15O(a,g)19Ne to X-ray bursts and superbursts

Details The importance of 15O(a,g)19Ne to X-ray bursts and superbursts The importance of 15O(a,g)19Ne to X-ray bursts and superbursts

2004-10-23

arxiv.org/abs/astro-ph/0410561v2

Astrophys.J.650:332-337,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, uses apj.sty, accepted for publ. in Astrophys. J

Scientific paper

10.1086/507083

One of the two breakout reactions from the hot CNOcycle is 15O(a,g)19Ne, which at low temperatures depends strongly on the resonance strength of the 4.033 MeV state in 19Ne. An experimental upper limit has been placed on its strength, but the lower limit on the resonance strength and thereby the astrophysical reaction rate is unconstrained experimentally. However, this breakout reaction is crucial to the thermonuclear runaway which causes type I X-ray bursts on accreting neutron stars. In this paper we exploit astronomical observations in an attempt to constrain the relevant nuclear physics and deduce a lower limit on the reaction rate. Our sensitivity study implies that if the rate were sufficiently small, accreting material would burn stably without bursts. The existence of type I X-ray bursts and superbursts consequently suggests a lower limit on the 15O(a,g)19Ne reaction rate at low temperatures.

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