Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.239...69h&link_type=abstract
In ESA Proceedings of ESA Workshop on a Cosmic X-Ray Spectroscopy Mission p 69-76 (SEE N86-22461 12-89)
Astronomy and Astrophysics
Astronomy
Interstellar Space, Stellar Spectra, X Ray Astronomy, X Ray Spectroscopy, Absorption Spectra, Cosmic Plasma, Emission Spectra, Spectral Resolution, Stellar Envelopes
Scientific paper
Results of low resolution X-ray spectroscopy are described to show how the properties of interstellar and circumstellar media are obtained. Further information to be obtained with higher spectral resolutions is discussed by reference to the observations of emission lines, absorption lines and absorption edges. Once the emission lines or the absorption edges are observed, the results are more simply related to plasma properties than those in other ranges, since the optical depth in the X-ray range is in most cases smaller and radiation transfer is less complicated. For the study of hot plasmas, X-ray spectroscopy provides more direct means, while allowed transitions in the XUV range for the same ions are weaker and not always observable because of strong interstellar absorption. Advantages in X-ray spectroscopy counterbalance disadvantages due mainly to the difficulty in collecting enough photons.
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