Plate 2: Spectra of Secchi star classes I–III
- 1870
Fig. 1: Spectrum of "yellow" stars. Secchi included the sun, Pollux, Arcturus, Aldebaran, and Procyon in this second of four classes of stars.
Fig. 2: Spectrum of "white" stars. Secchi included Sirius, Vega, Altair, Regulus, and Riegel in this first of four classes of stars.
Fig. 3: Spectrum of "red to orange" stars, particularly Alpha Herculis and Beta Pegasi. Secchi included Alpha Herculis, Beta Pegasi, Alpha Orion, and Antares in this third of four classes of stars.
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Cite as
Secchi, Angelo. “Plate 2: Spectra of Secchi Star Classes I–III.” In Le Soleil: Exposé Des Principales Découvertes Modernes Sur La Structure De Cet Astre, Son Influence Dans l'Univers Et Ses Relations Avec Les Autres Corps Célestes. Paris, France: Gauthier-Villars, 1870. https://digital.sciencehistory.org/works/db78tc05q.
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