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Based on photometric data obtained between 1935 and 2017, O − C diagrams were built for 22 RR Lyrae stars in the globular cluster NGC 6171, leading to the discovery of secular period changes in four variables for which we have calculated period change rates β. In contrast, we find that 82% of the sample stars have stable periods over the last 82 years. For the stable‐period stars, the whole database...
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