Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?
A) just above and to the right of B type stars
B) just above and to the right of O type stars
C) in the variable strip
D) in the instability strip
E) outside the H-R Diagram as missing items

Question

Quizplus · Accepted Answer

Cepheid and RR Lyrae variable stars are located in the instability strip on the H-R Diagram, a region where stars pulsate and vary in brightness due to changes in their outer layers.

Where Are the Cepheid and RR Lyrae Variable Stars Located