Astronomy and Astrophysics – Astrophysics
Scientific paper
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.
Blissett R. J.
Bowyer Stuart
Charles Phil A.
Kahn Steve M.
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