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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