Constraining Stellar Rotation at the Zero-age Main Sequence with TESS

Douglas, S. T.; Cargile, P. A.; Matt, S. P.; Breimann, A. A.; Pérez Chávez, J. A.; Huang, C. X.; Wright, N. J.; Zhou, G.

doi:10.3847/1538-4357/ad0fe3

Constraining Stellar Rotation at the Zero-age Main Sequence with TESS

Douglas, S. T.; Cargile, P. A.; Matt, S. P.; Breimann, A. A.; Pérez Chávez, J. A.; Huang, C. X.; Wright, N. J.; Zhou, G.

Authors

S. T. Douglas

P. A. Cargile

S. P. Matt

A. A. Breimann

J. A. Pérez Chávez

C. X. Huang

Nicholas Wright n.j.wright@keele.ac.uk

G. Zhou

Abstract

The zero-age main sequence (ZAMS) is a critical phase for stellar angular momentum evolution, as stars transition from contraction-dominated spin-up to magnetic wind-dominated spin-down. We present the first robust observational constraints on rotation for FGK stars at ≈40 Myr. We have analyzed TESS light curves for 1410 members of five young open clusters with ages between 25 and 55 Myr: IC 2391, IC 2602, NGC 2451A, NGC 2547, and Collinder 135. In total, we measure 868 rotation periods, including 96 new, high-quality periods for stars around 1 M ⊙. This is an increase of ten times the existing literature sample at the ZAMS. We then use the τ 2 method to compare our data to models for stellar angular momentum evolution. Although the ages derived from these rotation models do not match isochronal ages, we show that these observations can clearly discriminate between different models for stellar wind torques. Finally, τ 2 fits indicate that magnetic braking and/or internal angular momentum transport significantly impact rotational evolution even on the pre-main sequence.

Citation

Douglas, S. T., Cargile, P. A., Matt, S. P., Breimann, A. A., Pérez Chávez, J. A., Huang, C. X., …Zhou, G. (2024). Constraining Stellar Rotation at the Zero-age Main Sequence with TESS. Astrophysical Journal, 962(1), Article 16. https://doi.org/10.3847/1538-4357/ad0fe3

Journal Article Type	Article
Acceptance Date	Nov 13, 2023
Online Publication Date	Feb 1, 2024
Publication Date	Feb 1, 2024
Deposit Date	Feb 5, 2024
Publicly Available Date	Feb 5, 2024
Journal	The Astrophysical Journal
Print ISSN	0004-637X
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	962
Issue	1
Article Number	16
DOI	https://doi.org/10.3847/1538-4357/ad0fe3
Keywords	Stellar evolution, Open star clusters, Stellar rotation, Late-type stars
Publisher URL	https://iopscience.iop.org/article/10.3847/1538-4357/ad0fe3

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