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=1989esasp.296..283b&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 283-287 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

2

Cygnus Constellation, Noise Spectra, Power Spectra, Shot Noise, Variability, X Ray Binaries, Emission Spectra, Exosat Satellite, Frequency Measurement, Stellar Radiation

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 show a high rms, a complex shape and variations of the break frequency over one order of magnitude. Good agreement is obtained with a shot noise model with a distribution in shot lifetimes. The noise in Her X-1 shows variations correlated with the 35rd cycle of the source. The observations are consistent with occultation by the inner accretion disk.

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