Spectral Variability of the X-ray Pulsar Hercules X-1

Details Spectral Variability of the X-ray Pulsar Hercules X-1 Spectral Variability of the X-ray Pulsar Hercules X-1

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26..691l&link_type=abstract

Astronomy Letters, vol. 26, p. 691-698 (2000)

Astronomy and Astrophysics

Astronomy

2

Pulsars, Neutron Stars, X-Ray Sources, Scattering

Scientific paper

We present the results of our comparative timing and spectral analysis of the high and low (off) states in the X-ray pulsar Her X-1 based on data from the ART-P telescope onboard the Granat observatory. A statistically significant (several mCrab) persistent flux with a simple power-law spectrum was detected during the low state. The spectral slope changed from observation to observation by almost a factor of 2. Pulsations were detected only during the high state of the source, when its flux was a factor of ~25 larger than the low-state flux. The spectral shape of Her X-1 in its high state was complex, with the parameters depending on pulse phase.

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