Approximates a blackbody spectrum. Produces an Absorption Line spectrum.
Lines come from the elements in the stellar atmosphere.
Spectral Classification of Stars In 1866, Fr. Despite the many differences, some common spectral patterns emerged. Between 1886 and 1897, the Henry Draper Memorial Survey at Harvard carried out a systematic study of stellar spectra over the entire sky. Led primarily by Edward C. Pickering. Used objective prism photography from telescopes at Harvard and Arequipa, Peru.