On the H-R diagram, lines of constant radius are illustrated as _____.
A) sloping downward from right to left
B) sloping downward from left to right
C) running vertically on the right side
D) running horizontally on the top
E) moving in various direction depending on the type of star

Question

Quizplus · Accepted Answer

Lines of constant radius on the Hertzsprung-Russell (H-R) diagram slope downward from left to right. This is because, at a constant radius, a hotter star (left side of the diagram) will be more luminous than a cooler star (right side of the diagram), creating a downward slope as one moves from left (hotter) to right (cooler).

On the H-R Diagram, Lines of Constant Radius Are Illustrated