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

Question

Quizplus · Accepted Answer

The discovery that stars of the same temperature can have different radii led to the need for a way to categorize stars based on their luminosity (brightness). The luminosity classes were defined to solve this problem and are now included in the spectral classification system. The invention of the H-R diagram came later and was based on the knowledge gained from the luminosity classes. Choices A and B are incorrect as they do not address the issue of categorizing stars by their luminosity.

It Was Discovered That Stars of the Same Temperature Can