On the H-R diagram,lines of constant radius slant downward from left to right.

Question

Quizplus · Accepted Answer

Lines of constant radius on the H-R diagram, also known as evolutionary tracks, slope downward from left to right. This is because as a star evolves, it increases in luminosity and size (moving up and to the right on the diagram), but also decreases in surface temperature (moving down and to the left on the diagram). The intersection of the evolutionary track with a line of constant radius indicates the radius of the star at that point in its evolution.

On the H-R Diagram,lines of Constant Radius Slant Downward from Left