Type I X-ray Bursts at Low Accretion Rates

Details Type I X-ray Bursts at Low Accretion Rates Type I X-ray Bursts at Low Accretion Rates

2006-11-02

arxiv.org/abs/astro-ph/0611076v2

AIPConf.Proc.924:513-518,2007

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, submitted to the proceedings of the conference "The Multicoloured Landscape of Compact Objects and Their E

Scientific paper

10.1063/1.2774903

Neutron stars, with their strong surface gravity, have interestingly short timescales for the sedimentation of heavy elements. Recent observations of unstable thermonuclear burning (observed as X-ray bursts) on the surfaces of slowly accreting neutron stars ($< 0.01$ of the Eddington rate) motivate us to examine how sedimentation of CNO isotopes affects the ignition of these bursts. We further estimate the burst development using a simple one-zone model with a full reaction network. We report a region of mass accretion rates for weak H flashes. Such flashes can lead to a large reservoir of He, the unstable burning of which may explain some observed long bursts (duration $\sim 1000$ s).

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