Other
Scientific paper
Jan 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968jqsrt...8..305o&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 8, Issue 1, p. 305-315.
Other
1
Scientific paper
Perhaps the most tangible evidence of the existence and structure of postulated stellar chromospheres of otherwise relatively cool stars would be the detection of an intense ultraviolet spectrum. The solar case for which a variety of measurements is available now reveals that the observed spectrum depends in a very complex and not thoroughly understood manner on the physical and geometrical conditions, such as the nature of departures from thermodynamic equilibrium, inhomogeneities, the form of mechanical energy input, etc. At the same time it is obvious that some of these structural features are of little importance for the actual form of the ultraviolet spectrum, in particular, the intensity of the H, HeI, and HeII resonance lines and continua. A set of representative models has been investigated in order to establish realistic boundaries for the expected intensities of pertinent spectral features. It appears possible that the Lyman-α radiation from several near-by stars could indeed be detected with equipment presently available for rocket or satellite experiments.
Oster Ludwig
Patterson N. P.
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