Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..447k&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 447-452 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
5
Neutron Stars, Pulse Amplitude, Pulse Duration, Pulse Rate, Spectrum Analysis, Accretion Disks, Exosat Satellite, Occultation, Precession, Stellar Magnetospheres, Stellar Spectra
Scientific paper
In 1984 and 1985 Her X-1 was observed by EXOSAT during two 35 day cycles. A pulse profile change was observed and modeled by a free precessing neutron star. It is shown that the progressive intensity reduction from the left to the right pulse flank of the main pulse can be described by a highly ionized obscurating screen at the inner magnetospheric boundary of the accretion disk. There is evidence that the neutron Her X-1 performs a free precession movement.
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