What is a Cepheid variable star?
A) one of several classes of stars that pulsate randomly in brightness
B) a low-mass, horizontal-branch star that pulsates regularly in brightness
C) a star that normally remains constant in brightness but occasionally flares up in brightness by several magnitudes
D) a high-mass star that pulsates regularly in brightness
Correct Answer:
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Q263: What are the stars in the upper
Q264: Cepheid variables pulsate because they contain a
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Q276: RR Lyrae stars are:
A) pulsating stars that
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Q279: Cepheid stars are
A) giant stars that pulsate
Q282: The period of variability of a Cepheid
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