Branches and loops in the X-Ray colour-colour diagram of Cygnus X-3.

Details Branches and loops in the X-Ray colour-colour diagram of Cygnus X-3. Branches and loops in the X-Ray colour-colour diagram of Cygnus X-3.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..115s&link_type=abstract

Astronomy and Astrophysics, v.316, p.115-122

Astronomy and Astrophysics

Astrophysics

3

Stars: Individual: Cyg X-3, X-Rays: Stars

Scientific paper

We present an analysis of EXOSAT ME X-ray colour-colour diagrams of Cygnus X-3. Our sample contains all the Cygnus X-3 data collected during EXOSAT's operational life time and covers a total of 190 hours. The colour-colour diagrams display X-ray spectral variations with the 4.8 hour period and show the spectral distinction between the `high' and the `low' intensity state. We find that the 4.8 hour spectral variability produces a `loop' in the colour-colour diagram. When the 4.8 hour effect is removed, the spectra display residual long-term variability that is suggestive of the presence of `branches' in the colour-colour diagram.

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