The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232
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Authors
Binks, AS
Jeffries, RD
Jackson, RJ
Franciosini, E
Sacco, GG
Bayo, A
Magrini, L
Randich, S
Arancibia-Silva, J
Bergemann, M
Bragaglia, A
Gonneau, A
Hourihane, Anna
Jofré, P
Korn, AJ
Morbidelli, L
Prisinzano, L
Zaggia, S
Publication Date
2021-07Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
Publisher
Oxford University Press (OUP)
Volume
505
Issue
1
Pages
1280-1292
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Binks, A., Jeffries, R., Jackson, R., Franciosini, E., Sacco, G., Bayo, A., Magrini, L., et al. (2021). The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232. Monthly Notices of the Royal Astronomical Society, 505 (1), 1280-1292. https://doi.org/10.1093/mnras/stab1351
Abstract
<jats:title>ABSTRACT</jats:title>
<jats:p>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 &gt;50 per cent, although a uniformly high spot coverage does not match the CMD well across the full luminosity range considered.</jats:p>
Sponsorship
Leverhulme Trust (RPG-2012-541)
Identifiers
External DOI: https://doi.org/10.1093/mnras/stab1351
This record's URL: https://www.repository.cam.ac.uk/handle/1810/326924
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