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The Horizontal Branch of NGC 1851: Constraints from its RR Lyrae Variables

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Figure 1. Image of NGC 1851 showing the 25 RR Lyrae variables used in our analysis. The central 40  is designated by a circle
Figure 3. Histogram of the ratio of OoI stars in the Milky Way GCs. The Oosterhoff ratio of the NGC 1851 RR0 Lyrae stars is highlighted.
Figure 4. Qualitative comparison of the observed HB and the synthetic HB, assuming four separate HB components
Figure 5. Comparison between the theoretical periods and amplitudes from our synthetic HB vs

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