Which of the following is true about the instability strip on the H-R diagram?

Question

Quizplus · Accepted Answer

The instability strip on the H-R diagram is a region where stars show variability in their brightness due to pulsations. The pulsations are caused by changes in the outer layers of the stars, and the type and period of the pulsation depend on the star's mass and evolutionary stage. Within this region are two groups of pulsating stars, the RR Lyrae and Cepheids, which have different properties and can be used as distance indicators. Evolved stars also pulsate within the instability strip, as they have undergone changes in their structure and composition over time. Therefore, D, all of the above, is the correct answer.

Which of the Following Is True About the Instability Strip