Abstract
STARS WITH BRIGHT AND DARK HYDROGEN LINES.—In his observations of the spectrum of the well-known bright line star γ Argus during 1893-94, Prof. Campbell noted the remarkable fact that whilst the red line of hydrogen was quite bright, the hydrogen lines in the violet were dark. The same peculiarity was also observed in the spectrum of η Tauri.
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Our Astronomical Column. Nature 53, 15–16 (1895). https://doi.org/10.1038/053015a0
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DOI: https://doi.org/10.1038/053015a0