The temporal structure of very high energy gamma rays from VELA X-1

Details The temporal structure of very high energy gamma rays from VELA X-1 The temporal structure of very high energy gamma rays from VELA X-1

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..394r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 394-402.

Astronomy and Astrophysics

Astrophysics

27

Eclipsing Binary Stars, Gamma Rays, High Energy Interactions, Pulsars, X Ray Binaries, Light Curve, Neutron Stars, Supergiant Stars, Variable Stars

Scientific paper

Observations of Vela X-1 which confirm the 1986 measurements of North et al. (1987) are presented. The results establish Vela X-1 beyond any doubt as a source which persistently emits pulsed very high energy gamma-rays. The pulse period determination of 283.14 s in the X-ray region reported by Tsunemi (1987) is also confirmed. Five different but coherent enhancements were observed during 1987 which were clustered around X-ray eclipse and show a different light curve from the persistent emission. It is suggested that this may be indicative of very high energy gamma-ray production not only on or near the neutron star, but also on the limb of the companion.

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