RR Lyrae variables are likely to be found in:
A)very young clusters, where high-mass stars are undergoing core hydrogen burning.
B)giant molecular clouds, where protostars are forming from gas and dust clouds.
C)young-to-intermediate-age clusters, where high-mass stars are undergoing central helium burning.
D)globular clusters, where low-mass stars are undergoing core helium burning.

Question

Quizplus · Accepted Answer

RR Lyrae variables are often found in globular clusters, which are known to contain low-mass stars that are undergoing core helium burning.

RR Lyrae Variables Are Likely to Be Found In