Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A) Star A is hotter and bigger than Star B.
B) Star A is cooler and bigger than Star B.
C) Star A is hotter and smaller than Star B.
D) Star A is cooler and smaller than Star B.

Question

Quizplus · Accepted Answer

Star A is hotter because it is on the left side of the H-R diagram, and it must be smaller to have the same luminosity as the cooler Star B on the right side.

Star a Is Located at the Top Left of the H-R