Noise variability in CYG X-1 and HER X-1

Details Noise variability in CYG X-1 and HER X-1 Noise variability in CYG X-1 and HER X-1

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989xras.rept...17b&link_type=abstract

In its Contributions of the X Ray Astronomy Group of the Max-Planck-Institut für Extraterrestrische Physik p 17-21 (SEE N90-2419

Astronomy and Astrophysics

Astronomy

Neutron Stars, Noise Spectra, Shot Noise, Variability, X Ray Stars, Binary Stars, Cygnus Constellation, European Space Programs, Exosat Satellite, X Ray Astronomy

Scientific paper

The aperiodic variability in the x ray emission of Cyg X-1 and Her X-1 is examined from EXOSAT archive data by means of the production of broad band power spectra. The power spectra of Cyg X-1 is analyzed and show a complex shape and variations of the break frequency over one order of magnitude. Good agreement with the data is obtained using a shot noise model with a distribution in shot lifetimes. The noise in Her X-1 shows variations correlated with the 35d cycle of the source. The observations are consistent with occultation by the inner accretion disk.

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