Abstract
In Chapter 4, The X-ray Sky, we discussed the general properties of a class of sources designated as ‘compact X-ray sources’, or ‘stellar X-ray sources’, or ‘X-ray stars’. The essential features of these sources are: (i) A 2–6 keV luminosity in the range 1036-1038 erg s-1;(ii) Membership in binary systems as evidenced by eclipses or association with binaries; (iii) A flat spectrum similar to that produced by radiation from a hot gas having a temperature in the range 50–500 million degrees. The spectra of the eclipsing sources show a variable low energy cutoff; (iv) Fast, and in some cases, periodic variations on a time scale of seconds or less.
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