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… — Ejnar Hertzsprung Copy Share Image
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… — Ejnar Hertzsprung Copy Share Image
