What Is One of the Differences Between Cepheids and RR

question 10

Multiple Choice

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.

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