Ariel V observations of a 4.8-hr periodicity in the 'high-state' X-ray spectrum of Cygnus X-3

Details Ariel V observations of a 4.8-hr periodicity in the 'high-state' X-ray spectrum of Cygnus X-3 Ariel V observations of a 4.8-hr periodicity in the 'high-state' X-ray spectrum of Cygnus X-3

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194...77b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Jan. 1981, p. 77-84.

Astronomy and Astrophysics

Astronomy

19

Ariel 5 Satellite, Binary Stars, Stellar Spectra, X Ray Sources, Energy Spectra, Proportional Counters, X Ray Spectra

Scientific paper

Observations of Cygnus X-3 in 1975 May with the Ariel V proportional counter spectrometer reveal the existence of 4.8-hr periodic variations in the X-ray spectrum. Periodicity is observed in both the 2-6 keV continuum shape, and in the apparent energy of the iron-line, and occurs at a time of high mean source intensity. These results are compared with a similar behaviour noted by Becker et al. for the "low-state" spectrum. In contrast to the low-state observations, the data presented here do not suggest phase dependent absorption by material local to the source.

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