What is one of the differences between Cepheids and RR Lyrae variables?
A) Cepheids are giants, but RR Lyrae stars are still on the main sequence.
B) The pulsations of RR Lyrae stars are much less regular than those of Cepheids.
C) The RR Lyrae stars have much shorter periods than Cepheids.
D) The period- luminosity relation holds only for RR Lyrae stars.
E) All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity.

Question

Quizplus · Accepted Answer

Cepheids have longer periods, typically 1 to 100 days, while RR Lyrae stars have shorter periods, generally less than a day. This difference in period is a key distinguishing feature between the two types of variable stars.

What Is One of the Differences Between Cepheids and RR