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)All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity.
C)The period-luminosity relation holds only for RR Lyrae stars.
D)The pulsations of RR Lyrae stars are much less regular than those of Cepheids.
E)The RR Lyrae stars have much shorter periods than Cepheids.

Question

Quizplus · Accepted Answer

RR Lyrae stars have much shorter periods than Cepheids. One of the main differences between Cepheids and RR Lyrae variables is their period. RR Lyrae stars have much shorter periods (usually less than a day) than Cepheids (which can range from 1 to 100 days or longer). This difference in period is related to their physical properties and evolutionary history.

What Is One of the Differences Between Cepheids and RR