Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989xras.rept...22k&link_type=abstract
In its Contributions of the X Ray Astronomy Group of the Max-Planck-Institut für Extraterrestrische Physik p 22-27 (SEE N90-2419
Astronomy and Astrophysics
Astronomy
Exosat Satellite, Neutron Stars, Pulse Duration, X Ray Astronomy, Binary Stars, European Space Programs, Satellite Imagery, Spectrum Analysis, Stellar Spectra, X Ray Stars
Scientific paper
The observations of the Her X-1 performed by EXOSAT during two 35-day-cycles, in 1984 and 1985, are reported. A pulse profile change was observed and modeled by a free precessing neutron star (NS). It is shown that the progressive intensity reduction from the left to the right pulse flank of the main pulse can be described by highly ionized obscurating screen at the inner magnetospheric boundary of the accetion disk with a scale height of approximately 2 x 106/cm. A sideward tilt of approximately 60 degrees of the NS rotation axis accounts for the vertical movement of the poles of the NS causing the asymmetric obscuration of the main pulse. Further evidence that the Her X-1 performs a free precession movement is analyzed.
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