Soft X-ray spectral variations in Scorpius X-1

Details Soft X-ray spectral variations in Scorpius X-1 Soft X-ray spectral variations in Scorpius X-1

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..733k&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 733-738.

Astronomy and Astrophysics

Astrophysics

7

Binary Stars, Periodic Variations, Spectral Energy Distribution, X Ray Sources, X Ray Spectra, Absorption Spectra, Compton Effect, Heao 1, Helium Ions, Oxygen Spectra, Photoionization

Scientific paper

Soft X-ray spectra of Scorpius X-1 obtained with the low-energy detectors of the A-2 experiment on HEAO 1 are presented. The raw count spectra are deconvolved using the Kahn and Blissett technique to reveal the presence of oxygen absorption in the range 0.5-0.7 keV. The strength of this feature is shown to vary on a time scale of order hours. These results are interpreted as evidence for variable X-ray photoionization of circumsource material in the system. An alternative model, involving variable Compton broadening of an oxygen edge, is also discussed.

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