Light curves of RR Lyrae in the Sloan bands
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RR Lyrae stars are excellent tracers of the old population II due to their period-luminosity (PL) and period-luminosity-metallicity (PLZ) relations. While these relations have...
天琴座RR型变星（RR Lyrae stars）凭借周光（period-luminosity, PL）关系与周光金属量（period-luminosity-metallicity, PLZ）关系，成为古老第二星族的优质示踪天体。尽管此类关系已……
