Spectral behaviour of some X-ray binaries with the Sigma/Granat telescope
Abstract
Some hard X-ray/soft gamma-ray data of the Sigma/Granat telescope are revisited, where hardness-intensity diagrams (HIDs) for some X-ray binaries (all being black hole candidates) are produced; namely, the persistent source, Cygnus X-1, and the X-ray transient sources, Nova Muscae 1991 and Nova Persei 1992. Fractional intensity-intensity diagrams (FID's) are introduced and applied to these sources, which give a further insight into the spectral behaviour of these objects. One source shows a positive correlation between hardness and intensity (Cygnus X-1), another source shows a negative correlation (Nova Persei 1992), and still another one exhibits a more complex behaviour (Nova Muscae 1992).
- Publication:
-
Exploring the Gamma-Ray Universe
- Pub Date:
- September 2001
- Bibcode:
- 2001ESASP.459..337S
- Keywords:
-
- X-RAY BINARIES;
- SIGMA/GRANAT DATA