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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31676
Title: The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232
Authors: Binks, A. S.
Jeffries, R. D.
Jackson, R. J.
FRANCIOSINI, Elena 
SACCO, GIUSEPPE GERMANO 
Bayo, A.
MAGRINI, LAURA 
RANDICH, Maria Sofia 
Arancibia-Silva, J.
Bergemann, M.
BRAGAGLIA, Angela 
Gilmore, G.
Gonneau, A.
Hourihane, A.
Jofré, P.
Korn, A. J.
MORBIDELLI, LORENZO 
PRISINZANO, Loredana 
Worley, C. C.
ZAGGIA, Simone 
Issue Date: 2021
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 505
Issue: 1
First Page: 1280
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.
URI: http://hdl.handle.net/20.500.12386/31676
URL: http://arxiv.org/abs/2105.01153v1
https://academic.oup.com/mnras/article/505/1/1280/6274699
ISSN: 0035-8711
DOI: 10.1093/mnras/stab1351
Bibcode ADS: 2021MNRAS.505.1280B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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