Binks, AS ORCID:, Jeffries, RD ORCID:, Jackson, RJ, Franciosini, E, Sacco, GG, Bayo, A, Magrini, L, Randich, S, Arancibia, J, Bergemann, M, Bragaglia, A, Gilmore, G, Gonneau, A, Hourihane, A, Jofré, P, Korn, AJ, Morbidelli, L, Prisinzano, L, Worley, CC and Zaggia, S The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232. (Unpublished)

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Astrometry and photometry from {\it Gaia} and spectroscopic data from the {\it Gaia}-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialised spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of $38\pm 3$ Myr is inferred by comparing the LDB location in absolute colour-magnitude diagrams (CMDs) with the predictions of standard models. This is more than twice the age derived from fitting isochrones to low-mass stars in the CMD with the same models. Much closer agreement between LDB and CMD ages is obtained from models that incorporate magnetically suppressed convection or flux-blocking by dark, magnetic starspots. The best agreement is found at ages of $45-50$\,Myr for models with high levels of magnetic activity and starspot coverage fractions $>50$ per cent, although a uniformly high spot coverage does not match the CMD well across the full luminosity range considered.

Item Type: Article
Subjects: ?? astro-ph.SR ??
?? astro-ph.GA ??
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
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Depositing User: Symplectic
Date Deposited: 14 May 2021 10:36
Last Modified: 14 May 2021 10:36

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