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Secchi's
Four Classes of Stellar Spectra
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| 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. Copyright uncertain, see this note. |
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Copyright ©. Brought to you by the Center for History of Physics, a Division of the American Institute of Physics |
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