Plate 16: Luminosity Effects Near B8

Star Index

Plate 16: Luminosity Effects Near B8

Because of the weakness of most of the spectral lines near B8, spectrograms of two scales are required to obtain the highest precision for both spectral types and luminosity classes. The spectrograms illustrated below (scale ~126 A/mm) allow luminosity classes to be determined with good accuracy from the intensities of the Balmer lines of H; widened spectrograms of scale ~40 A/mm are necessary for the precise determination of spectral types for the later B stars (see Atlas Plate: “Five B7 III–B9 III Stars”).

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