INTEGRAL monitoring of unusually long X-ray bursts

Details INTEGRAL monitoring of unusually long X-ray bursts INTEGRAL monitoring of unusually long X-ray bursts

2008-11-06

arxiv.org/abs/0811.0904v1

PoS Integral08:033,2008

Astronomy and Astrophysics

Astrophysics

Talk presented at the 7th INTEGRAL Workshop, An INTEGRAL View of Compact Objects, Copenhagen, 8-11 September 2008. Submitted t

Scientific paper

X-ray bursts are thermonuclear explosions on the surface of accreting neutron stars in low mass X-ray binaries. As most of the known X-ray bursters are frequently observed by INTEGRAL, an international collaboration have been taking advantage of its instrumentation to specifically monitor the occurrence of exceptional burst events lasting more than ~10 minutes. Half of the so-called intermediate long bursts registered so far have been observed by INTEGRAL. The goal is to derive a comprehensive picture of the relationship between the nuclear ignition processes and the accretion states of the system leading up to such long bursts. Depending on the composition of the accreted material, these bursts may be explained by either the unstable burning of a large pile of mixed hydrogen and helium, or the ignition of a thick pure helium layer. Intermediate long bursts are particularly expected to occur at very low accretion rates and make possible to study the transition from a hydrogen-rich bursting regime to a pure helium regime.

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