EXOSAT observations of Cygnus X-1 - Study of the soft X-ray excess

Details EXOSAT observations of Cygnus X-1 - Study of the soft X-ray excess EXOSAT observations of Cygnus X-1 - Study of the soft X-ray excess

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..439b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 439-450.

Astronomy and Astrophysics

Astronomy

47

Exosat Satellite, Spaceborne Astronomy, Stellar Spectra, X Ray Binaries, Black Body Radiation, Color-Color Diagram, Emission Spectra, Light Curve, Metallicity, Stellar Spectrophotometry

Scientific paper

The paper presents results of a spectral analysis of the Cyg X-1 data collected during 1984-1985 by the Medium Energy instrument onboard the Exosat satellite. Emphasis is on two issues: the soft X-ray excess in the range below 3 keV and the iron-line intensity. The presence of a soft component in addition to the high-energy power-law component is confirmed in all spectra, including during the dips. The soft component can be approximated by a black-body spectrum with a variable intensity and a temperature of 0.25 keV. Variations in the absorption by cold matter for the soft and hard component are found to be sufficient to explain the changes in the X-ray spectra during dips.

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