Binks, AS, Jeffries, RD, Sacco, GG, Jackson, RJ, Cao, L, Bayo, A, Bergemann, M, Bonito, R, Gilmore, G, Gonneau, A, Jiminéz-Esteban, F, Morbidelli, L, Randich, S, Roccatagliata, V, Smiljanic, R and Zaggia, S (2022) The Gaia-ESO survey: Constraining evolutionary models and ages for young low mass stars with measurements of lithium depletion and rotation. Monthly Notices of the Royal Astronomical Society, 513 (4). pp. 5727-5751. ISSN 0035-8711

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A growing disquiet has emerged in recent years that standard stellar models are at odds with observations of the colour-magnitude diagrams (CMDs) and lithium depletion patterns of pre-main sequence stars in clusters. In this work we select 1246 high probability K/M-type constituent members of five young open clusters (5-125 Myr) in the Gaia-ESO Survey to test a series of models that use standard input physics and others that incorporate surface magnetic fields or cool starspots. We find that: standard models provide systematically under-luminous isochrones for low-mass stars in the CMD and fail to predict Li-depletion of the right strength at the right colour; magnetic models provide better CMD fits with isochrones that are similar to 1.5-2 times older, and provide better matches to Li depletion patterns. We investigate how rotation periods, most of which are determined here for the first time from 'Transiting Exoplanet Survey Satellite data, correlate with CMD position and Li. Among the K-stars in the older clusters we find the brightest and least Li-depleted are the fastest rotators, demonstrating the classic 'Li-rotation connection' for the first time at similar to 35 Myr in NGC 2547, and finding some evidence that it exists in the early M-stars of NGC 2264 at < 10 Myr. However, the wide dispersion in Li depletion observed in fully convective M-dwarfs in the gamma Vel cluster at similar to 20 Myr appears not to be correlated with rotation and is challenging to explain without a very large (> 10 Myr) age spread.

Item Type: Article
Additional Information: The final version of this accepted manuscript and all relevant information related to it, including copyrights, can be found on the publisher website. Accepted manuscripts are PDF versions of the author’s final manuscript, as accepted for publication by the journal but prior to copyediting or typesetting. They can be cited using the author(s), article title, journal title, year of online publication, and DOI. They will be replaced by the final typeset articles, which may therefore contain changes. The DOI will remain the same throughout.
Uncontrolled Keywords: stars: kinematics and dynamics, stars: late-type, stars: pre-main-sequence, (Galaxy:) solar neighbourhood
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 11 May 2022 13:11
Last Modified: 20 Jul 2022 13:55

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