Abstract
II. A SERIES of observations such as ours ought to add at least a little to our knowledge of the development by which the spectra of stars pass from the second class to one of the two sections of the third, especially if these observations are combined with those made of the stars of the two first classes generally, and of our sun in particular; we might even draw conclusions as to the successive development of stars after they have already reached this class. He who sees trees in a forest in different stages of development, some old, some young, some decaying, can at once form an idea of the different stages undergone by each: it is just the same with the observer of the different classes of stellar spectra.
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Dunér on Stars with Spectra of Class III 1 . Nature 37, 260–262 (1888). https://doi.org/10.1038/037260a0
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DOI: https://doi.org/10.1038/037260a0