The Energy Dependence of the X-ray Pulse Shape of Her X-1

Details The Energy Dependence of the X-ray Pulse Shape of Her X-1 The Energy Dependence of the X-ray Pulse Shape of Her X-1

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99s.139l&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.139

Astronomy and Astrophysics

Astronomy

Scientific paper

Various geometries for the accretion column/emission region on the surface of the neutron star in Her X-1 have been considered. Only a filled cone-shaped region can yield the observed pulse shape. The resulting accretion column model is also consistent with the 35-day evolution of the pulse shape, which is caused by occultation of the emitting region by the inner and outer edges of the accretion disk. Here this model is described, and additionally is applied to observations of the X-ray pulse shape at several different X-ray energies. The result is that the emission spectra of the top surface and the side surface of the accretion column are both derived from observations. The resulting spectra are compared to theoretical calculations of emission from strongly magnetized plasma.

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