The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232
Date Issued
2021
Author(s)
Binks, A. S.
•
Jeffries, R. D.
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Jackson, R. J.
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•
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Bayo, A.
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•
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Arancibia-Silva, J.
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Bergemann, M.
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Gilmore, G.
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Gonneau, A.
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Hourihane, A.
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Jofré, P.
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Korn, A. J.
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•
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Worley, C. C.
•
Abstract
Astrometry and photometry from Gaia and spectroscopic data from the Gaia-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialized spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of 38 ± 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.
Volume
505
Issue
1
Start page
1280
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.505.1280B
Rights
open.access
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