NGTS clusters survey - VI: Stellar rotation in seven young open clusters within the PLATO LOPS2 field

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ID: 325097
2026
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Abstract
Abstract We present NGTS measurements of rotation period distributions for FGKM stars in seven young open clusters spanning ~ 40–700 Myr within PLATO’s first long-stare LOPS2 field. We measure 1063 rotation periods, of which 479 are newly analysed as part of cluster specific rotation studies, whilst 63 are unique periods not reported in the recent TESS All-Sky Rotation Survey. Of the 1063 rotation periods, 285 are identified as likely binary or higher order multiple systems using colour-magnitude diagrams and Gaia astrometry. These are the first comprehensive rotation period distributions for Trumpler 10, NGC 2451 B and Alessi 3, while extending existing distributions for NGC 2451 A, NGC 2516, Collinder 135 and IC 2391, to create a fuller picture on the rotation state of young stars in PLATO’s LOPS2 field. We find that main-sequence solar-mass stars in the ~ 40 Myr old NGC 2451 B cluster, form a slow sequence that can be distinguished from their counterparts at ~ 70–80 Myr, thereby significantly reducing the age at which young stellar groups can be relatively aged via their rotation sequences. We also observe stalled spin down from the age of NGC 2451 A to at least that of NGC 2516 (~ 70 – 150 Myr) at masses ≳ 1 M⊙, supporting previous predictions that angular momentum redistribution and removal should result in a wave of stalled spin down that propagates as a function of both mass and age. Finally, we provide a new age estimate for Alessi 3 of 687 ± 106 Myr using differential gyrochronology age dating.
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Authors A. Hughes, Edward Gillen, Matthew P. Battley, Deepak Chahal, Beatrice Caccherano, Anderson, David, 1966-, Ioannis Apergis, Daniel Bayliss, Matthew Burleigh (20341974), Jorge Fernández Fernández, M. R. Goad, G. M. Harvey, James S Jenkins, Alicia Kendall, James McCormac, Jose Moyano, Gavin Ramsay, Suman Saha, Jose Vines, R. G. West, P. J. Wheatley
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1557
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