The 35-day cycle of Hercules X-1

Details The 35-day cycle of Hercules X-1 The 35-day cycle of Hercules X-1

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mperp.204.....k&link_type=abstract

MPE Rep., No. 204, 139 pp.

Astronomy and Astrophysics

Astronomy

Cycles, Exosat Satellite, Hercules Nova, X Ray Stars, European Space Programs, Magnetopause, Neutron Stars, Nutation, X Ray Astronomy

Scientific paper

The 35-day cycle of the compact X-ray emitting star Her X-1 was investigated using EXOSAT observations. The pulse form of Her X-1 in the energy range between 1 and 30 keV was determined with high statistical significance, and the change of the pulse profile during the cycle was described. The observations of the free precession (nutation) of Her X-1 within a half precession cycle allowed to determine the precession geometry for the neutron star. The evaluation of observations in the soft spectrum of Her X-1 provided clarifications concerning the extended reprocessing regions at the magnetopause of the neutron star.

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