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An Accretion Column Model for the Accreting Pulsar Hercules X-1

Published online by Cambridge University Press:  19 July 2016

D. A. Leahy
D. A. Leahy*
Affiliation:
University of Calgary, Alberta T2N 1N4, Canada

Abstract

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A model is developed here to reproduce the pulse shape of Her X-1. The 35-day cycle of pulse shape changes during the 35-day Her X-1 cycle “High – Low – Short High – Low” is caused by varying obscuration of the emission region by the accretion disk. The observed sequence of pulse shape changes imply a pencil beam from the near pole and a fan beam from the far pole. Using a newly developed code for modeling accretion column emission, including accurate treatment of gravitational light-bending effects, the observed pulse shape of Her X-1 is modeled here.

Type
Part 11: Accreting Pulsars
Information
Symposium - International Astronomical Union , Volume 218: Young Neutrons Stars and their Environments , 2004 , pp. 447 - 448
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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