BVRI light curve of RR Lyrae V* AX UMa
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The pulsation periods of RR-Lyrae stars usually vary with time, and they are often used as probes to study the mechanism behind the variation. After the early discovery that the...
天琴座RR型变星（RR-Lyrae stars）的脉动周期通常随时间发生变化，这类天体常被用作研究该周期变化背后机制的探测探针。在早期发现……之后
