It was discovered that stars of the same temperature can include stars of different radii. The response to this finding was
A) to refine the spectral classification scheme by introducing subheadings 0-9.
B) to revise the spectral classification to start with O rather than A.
C) to define the luminosity classes.
D) to invent the H-R diagram.

Question

Quizplus · Accepted Answer

Luminosity classes were introduced to account for the differences in luminosity (and thus size) among stars of the same spectral type or temperature. This classification helps distinguish between stars of the same temperature but different sizes, such as giants, supergiants, and main-sequence stars.

It Was Discovered That Stars of the Same Temperature Can