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Secchi's Four Classes of Stellar Spectra

  Secchi's four classes of stellar spectra, from a colored lithograph
in a book published around 1870. This shows how someone
looking through a spectrograph on a large telescope would see
the spectrum from the brightest stars. The spectra would be
much fainter for most stars, making for difficult observing. The
principal spectral lines are identified underneath by letters that Fraunhofer assigned.

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Spectroscopy and the Birth of Astrophysics