Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9328202d&link_type=abstract
Thesis - Ludwig-Maximilians Univ. Max-Planck-Inst. für Physik und Astrophysik, Garching (Germany).
Astronomy and Astrophysics
Astrophysics
Double Stars, Hercules Nova, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, X Ray Stars, Companion Stars, Cyclotron Resonance, Emission Spectra, Exosat Satellite, Long Term Effects, Monte Carlo Method, Precession, Stellar Flares, Stochastic Processes
Scientific paper
LMCX-4 and Her X-1 systems are examined from Exosat observations to understand physical phenomena such as long term effects. Qualitative results, such as rotation behavior, pulse profile, spectrum, mass transport and thirty day cycle of LMCX-4, and mass transport and thirty five day cycle of Her X-1, are obtained. The processes used for Exosat data evaluation are presented: a method was developed to distinguish recorded X-ray photons according to their energy in the x-ray spectrum examination and dead time, energy, background, position, shading and tracking corrections of counting rates were achieved. It is concluded that both systems are accretion driven stellar x-ray sources with comparable dimensions, and are neutron stars with a mass similar to compact objects. It is shown that rotation of both neutron stars is in an equilibrium state and that the time behavior of x-ray intensity is characterized by three periods. It is proved that the gravitation field of the optical companion activates spiral density waves in the accretion disks of LMCX-4 and Her X-1, which extend to the magnetosphere and are countrarotating to the trajectory around the neutron stars during long term cycle.
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