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Measuring Rotation Periods in Crowded Star Clusters with TESS: A Proof of Concept with NGC 3532

  • Authors: Matthew S. Stafford, Jason Lee Curtis, Marcel A. Agüeros

Matthew S. Stafford et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 13.

CPDs for NGC 3532 based on quality classification of the final Prot measurement reported for each star. Measurements classified as Quality 3 represent our highest-confidence Prot, where the measured period was consistent across all three TESS cycles. Quality 2 Prot are measurements that agreed in two TESS cycles, and Quality 1 Prot were measured in only one cycle, corresponding to the longest Prot measured in cases where measurements in multiple cycles disagreed. In total, we make new Prot measurements for 885 stars, all of which are plotted in the bottom-right CPD. The yellow crosses in that CPD correspond to the 228 stars with HDBSCAN membership probabilities of <50% as indicated by E. L. Hunt & S. Reffert (2023) and for which we make new Prot measurements. Many of these lower-probability members fall on the slow-rotating sequence, suggesting that they are a part of the coeval NGC 3532 population and are likely cluster members.

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