Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982asee.nasa.....h&link_type=abstract
In NASA. Marshall Space Flight Center The 1982 NASA/ASEE Summer Fac. Fellowship Program 12 p (SEE N83-17359 07-80)
Physics
Binary Stars, Deposition, Mass Transfer, Pulsed Radiation, X Rays, Absorption, Angular Momentum, Eclipses, Neutron Stars
Scientific paper
The existing model for pulsed X-ray emission from the source Hercules X-1 is reviewed. A necessary part of this model is a processing accretion disk which turns the source on and off with 35 day cycle. It is usually assumed that precession of the primary star in this binary system, Hz Hercules, slaves the disk to its precession rate. This model can account for the system behavior in a qualitative manner. Precession of Hz Hercules with 35 day period requires precession of the binary orbit. Pulse arrival times from Herc X-1 have been analyzed for orbital precession. The inclusion of precession does not significantly improve the results obtained assuming a non-precessing orbit. The fluid dynamical stability of extra-galactic jets and the possible consequences of Kelvin-Helmholtz instability at the jet surface external medium interface are considered.
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