Berlin 2005 – wissenschaftliches Programm
EP 12.3: Vortrag
Dienstag, 8. März 2005, 14:45–15:00, TU BH349
Pulse Shape Formation in Accreting X-Ray Pulsars — •Ute Kraus — Theoretische Astrophysik, Uni Tübingen
The pulse shapes of accreting X-ray pulsars are complex: often strongly modulated, in general dependent on photon energy and on luminosity, and at the same time stable and characteristic of each source.
I present model calculations that show how geometric effects and relativistic effects in combination produce typical properties of X-ray pulsar profiles. Taking full account of gravitational light deflection near the neutron star, these models include shadowing, reprocessing regions and displaced magnetic poles. Filled, hollow and sectional hollow accretion funnels are studied. The resulting pulse shapes show asymmetry, an energy-dependent relative size of peaks and an energy-dependent degree of modulation.