Abstract
Until quite recently, there has been little hard evidence for the existence of discrete features (such as emission lines) in the spectra of X-ray sources. The basic problem, of course, has been that the exposure obtainable with contemporary instrumentation has precluded the effective utilization of dispersive techniques, so that we were limited to the use of proportional counters (with typical resolving power E/ΔE no better than ˜ 5) for spectroscopic study. Nevertheless, the high relative abundance of Fe has allowed the detection of both thermal and fluorescent emission lines from a variety of astrophysical contexts, even with the relatively poor resolution available with proportional counters, so that we could be certain that better resolution would eventually allow the detection of emission features from atomic transitions which were less pronounced relative to the surrounding continuum.
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