Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..335m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 335-340.
Astronomy and Astrophysics
Astrophysics
1
Charged Particles, Gamma Rays, Particle Beams, Stellar Magnetic Fields, X Ray Binaries, Companion Stars, Line Of Sight, Pulsars, Steering
Scientific paper
Possible implications of several bursts of pulsed TeV gamma-ray emission detected during observations of the high-mass binary Vela X-1 are presented. These are examined in the context of the dumping of beams of ultrarelativistic charged particles onto the limb of the supergiant compansion star. The orbital phase modulation of pulsed gamma-rays from the high-mass binary Centaurus X-3 is also examined in order to explore the possibility that the gamma rays originate at the collisions of charged particles with an accretion wake trailing the X-ray pulsar. The detection of gamma rays at energies of about 1.4 TeV during eclipse places a lower limit of about 10 mG to the strength of the magnetic field at the surface of the supergiant component HD 77581 for a proton-proton to gamma-ray yield efficiency of 10 percent. PeV gamma-ray observations of Vela X-1 indicate that the field strength at HD 77581 might not be much higher than this value.
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