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Transient outburst mechanisms - ADS

Abstract

The recent discovery of a new class of recurrent and fast X-ray transient sources, the Supergiant Fast X-ray Transients, poses interesting questions on the possible mechanisms responsible for their transient X-ray emission. The association with blue supergiants, the spectral properties similar to those of accreting pulsars and the detection, in a few cases, of X-ray pulsations, confirm that these transients are High Mass X-ray Binaries. Their transient behaviour is quite surprising since neutron stars accreting from the winds of supergiant companions were seen as persistent sources. I review the different mechanisms proposed to explain their transient outbursts and the link to the persistent sources.


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