RR Lyrae variables are a type of short-period variable stars that are characterized by their pulsating nature. They are named after the prototype star, RR Lyrae, which was discovered in the constellation Lyrae. Here are some key features of RR Lyrae variables: 1. **Pulsation**: RR Lyrae stars exhibit periodic brightness changes due to pulsations in their outer layers. These changes in brightness typically occur over a period ranging from about 0.2 to 1 day.
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