X-ray Variability of the Pulsar Vela X-1 as Observed with ART-P/Granat

Details X-ray Variability of the Pulsar Vela X-1 as Observed with ART-P/Granat X-ray Variability of the Pulsar Vela X-1 as Observed with ART-P/Granat

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26..765l&link_type=abstract

Astronomy Letters, vol. 26, p. 765-771 (2000)

Astronomy and Astrophysics

Astronomy

4

Neutron Stars, Pulsars, X-Ray Sources

Scientific paper

Observations of the X-ray pulsar Vela X-1 with the ART-P telescope onboard the Granat Observatory are presented. Variability on a time scale of several thousand seconds was detected; intensity variations are shown to be accompanied by changes in the source's spectrum. The hardness was also found to be highly variable on a scale of one pulsation period. The source's spectrum exhibits an absorption feature at energy ~27 keV, which is apparently attributable to cyclotron scattering/absorption in the neutron-star magnetic field. Weak persistent emission was detected during an X-ray eclipse, which probably resulted from the scattering of pulsar emission in the stellar wind from an optical star.

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