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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 12.

Comparisons of the Prot measured using TESS light curves from Cycles 1, 3, and 5 with those from D. J. Fritzewski et al. (2021a), before (left) and after (right) our analysis removing our erroneous measurements. The shaded region indicates a difference of ≤15% between the TESS and literature Prot values, which we take to be an agreement in the measurements. We also include 2:1 and 1:2 lines to indicate possible harmonic or subharmonic measurements. The classification assigned to each Prot measurement in D. J. Fritzewski et al. (2021a) is indicated with a different symbol. Even before analyzing our results, we have a high Prot recovery rate (50%–60%) for the high-confidence (class 1) measurements from D. J. Fritzewski et al. (2021a), shown as filled cyan squares. Our initial agreement rate for lower-confidence measurements—especially those obtained using activity as a prior (class 3; filled orange triangles)—is systematically lower (≈40%–50%). Our analysis of cases where our measurements differ significantly from those of D. J. Fritzewski et al. (2021a) allows us to improve our recovery rate, so that it reaches ≳80% for the class 1 Prot, while the other classes of Prot measurements saw slightly smaller improvements in agreement rate.

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