In my opinion the separation of the c- and ac-stars is the most important advancement in stellar classification since the trials by Vogel and Secchi ... To neglect the c-properties in classifying stellar spectra, I think, is nearly the same thing as if a zoologist, who has detected the deciding differences between a whale and a fish, would continue classifying them together.
Ejnar HertzsprungTags: stars opinion astronomy angelo-secchi categorizing hermann-carl-vogel secchi stellar-classification stellar-spectra vogel
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