If you observe a variable star with a period of 50 days as a yellow, supergiant star, then you most likely have seen a(n) ____.
A) degenerate star
B) RR Lyrae variable star
C) eclipsing binary star
D) Cepheid variable star
E) Type I pulsar

Question

Quizplus · Accepted Answer

A yellow supergiant star with a 50-day period is most likely a Cepheid variable star. This is because Cepheids have periods ranging from a few days to over 100 days, and are known to be yellow supergiant stars. The other options, such as degenerate stars, RR Lyrae stars, eclipsing binaries, and Type I pulsars, do not fit the given characteristics of a yellow supergiant with a 50-day period.

If You Observe a Variable Star with a Period of 50