Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..334b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 334-344.
Astronomy and Astrophysics
Astronomy
2
Cosmic Rays, Gamma Ray Astronomy, Peculiar Stars, Pulsars, Stellar Magnetic Fields, X Ray Binaries, Doppler Effect, Vortices
Scientific paper
The phenomena known for Her X-1 seem best explained by precession of magnetic vortex tubes (MVTs). A pinched MVT affords a mechanism for accelerating charges to the maximum observed cosmic ray energies. In particular, the 1016eV particles required to generate ultrahigh energy γ-rays can be produced. Radiation pulses are generated when electron bunches encounter a transverse magnetic field, explaining the 1.24 s pulses of X-ray flux from Her X-1. The periodic Doppler shift in the arrival times of the pulses indicates circular motion of the X-ray source, but motion of a source located in a precessing MVT rather than motion in a binary system. The X-ray eclipses, with period 1.7 d, are by an object of diameter at least 6 R_sun;, unless the emission is beamed. The outer 40% of this object is transparent to TeV γ-rays. A possibility is a corona around HZ Her, with electron density ≅1013cm-3. The 35 d high-low cycle is probably caused by variable obscuration of the X-ray source. There is reason to attribute the obscuration to differential rotation between source and structured gas.
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