Plate 8: Luminosity Effects at B1

Star Index

Plate 8: Luminosity Effects at B1

The amplitude of the changes of the Balmer and helium lines with luminosity decreases on passing from type B2 to B1. The sensitivity to luminosity of the O II lines at B1 tends to increase the precision of the luminosity classification at that type; however, the sensitivity of these lines to temperature requires exceedingly accurate determinations of spectral type for their use.

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