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http://hdl.handle.net/20.500.12386/31676
Titolo: | The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232 | Autori: | 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 |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 505 | Fascicolo: | 1 | Da pagina:: | 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 |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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