Plate 5: Luminosity Effects at O9

Star Index

Plate 5: Luminosity Effects at O9

The O III blend near λ3760 is much stronger in classes O9 Ib and O9 III than in corresponding luminosity classes at B0. The ratio of C III 4649 to He II 4686 is a sensitive discriminant for luminosity. The intensities of the Balmer series of H also show a well–marked negative luminosity effect.

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