Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..299m&link_type=abstract
(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Hydrogen Clouds, Interstellar Gas, Spaceborne Astronomy, Ultraviolet Spectra, Abundance, Deuterium, Far Ultraviolet Radiation, H Lines, Interstellar Extinction, Line Spectra, Oao 3, Satellite Observation
Scientific paper
Results are reviewed for Copernicus far-UV measurements of the absorption lines of H I, D I, H2, and heavier elements in the interstellar gas. Column densities along several lines of sight, as estimated from Ly-alpha absorption-line profiles, confirm that wide differences in the gas density are present in various directions. The measurement of interstellar D I implies an open universe unless alternate sources for this nuclide are found. Analysis of reddened stars for which the line of sight passes through one or more interstellar clouds indicates a depletion of several heavy elements in the gas. It is suggested that the depleted elements may be present in grains rather than molecules and that the intercloud medium may consist primarily of H II with a few small H I clouds.
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