An Atlas of Stellar Spectra

@article{Morgan1943AnAO,
  title={An Atlas of Stellar Spectra},
  author={William Wilson Morgan and Philip Childs Keenan and Edith Kellman},
  journal={Nature},
  year={1943},
  volume={152},
  pages={147-147}
}
THIS much-needed atlas defines a two-dimensional classification system of stellar spectra by means of a sequence of standard spectra, many of which are illustrated in the fifty-five photographic prints forming the main body of the work. The spectra were taken specially for the purpose on a small one-prism spectrograph attached to the 40-in. Yerkes refractor. The standard stars chosen, which are mostly brighter than the eighth apparent magnitude, are of types from 05 to M2, and were selected to… 

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