Question

question 5 of 19 > the images show the light curves for four variable stars, either rr lyrae or cepheid stars. arrange these stars by their average luminosities. note that the luminosity scale on each graph is not given and is not the same.

Explanation:

Step1: Recall period - luminosity relation

Cepheid stars have a longer period and higher luminosity compared to RR Lyrae stars. Light - curve C has the longest period among them, so it is likely a Cepheid star and has high luminosity.

Step2: Analyze other light - curves

Light - curve B has a longer period than A and D. Light - curve A and D have relatively short periods. Among A and D, A has a longer period than D.

Answer:

Light curve C, Light curve B, Light curve A, Light curve D