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Name:Ingo Kreykenbohm
Institution:Dr. Karl Remeis Observatory & ECAP
Country:Germany
Title:Transient outbursts as laboratories of accretion physics
Abstract:Monitoring the outburst of transient accreting X-ray pulsars from the onset of the outburst until the very end of outburst reveals a wide variety of behaviour. For example, some spectral properties like the energy of cyclotron resonant scattering features or the shape of the pulse profiles among others depend on luminosity and/or time in some sources while other sources show no such behavior. Also some transient sources exhibit a sudden turn-off at the end of the outburst indicating the onset if the propeller effect. The observation of such distinct behavior allows to draw conclusions on the physics of the accretion process. I will therefore review some behaviors observed in outbursts of transient souces and the implications on the accretion process.