- The role of comptonisation in energy spectra of standard QPO-sources
- ESA SP
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
The spectral variability in the color-color diagram in Quasi-Periodic Oscillation (QPO) sources is discussed. The blackbody spectra comptonized by a hot electron plasma also fit the EXOSAT spectra of these sources. A parametrization of the color-color diagram indicates systematical parameter variations in all spectral branches. They can be decomposed in a variation of a single photon source and an extended hot electron cloud. The temperature of the photon source varies between 0.5 and 1.0 keV, the electron cloud has scattering depths between 3 and 7 and temperatures from 2.0 to 5.0 keV. Links to QPO models on the horizontal spectral branch and physical consequences of the model are discussed.
- Proceedings title: Proceedings of the 23rd ESLAB symposium on two topics in X-ray astronomy, Bologna, Italy, 13-20 September
1989: vol. 1. X-ray binaries
Publisher: ESA Publications Division
Place of publication: Noordwijk
Editors: J.J. Hunt, B.T. Battrick
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