Abstract
THE work of Saha, Fowler, and Milne has shown how the intensities of ionised lines in stellar spectra are dependent upon temperature, pressure, ionisation, and excitation potentials. By studying the changes in intensity of a line from stars of one spectral class to another, astrophysical estimates have been made of the ionisation potentials of certain of the elements by several investigators.
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DOUGLAS, A. Astrophysical Estimates of Ionisation Potentials of Iron, Yttrium, and Lanthanum. Nature 121, 906 (1928). https://doi.org/10.1038/121906a0
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DOI: https://doi.org/10.1038/121906a0
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