期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 505, 期 1, 页码 1280-1292出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1351
关键词
stars: kinematics and dynamics; stars: late-type; stars: pre-main-sequence; solar neighbourhood
资金
- Science and Technology Facilities Council (STFC)
- European Southern Observatory (ESO) Telescopes at the La Silla Paranal Observatory [188.B-3002]
- UK Science and Technology Facilities Council
- European Union FP7 programme through European Research Council (ERC) [320360]
- Leverhulme Trust [RPG-2012-541]
- INAF
- Ministero dell' Istruzione, dell' Universita e della Ricerca (MIUR)
Astrometry and photometry data from Gaia, combined with spectroscopic data from the Gaia-ESO Survey, were used to identify the lithium depletion boundary in the young cluster NGC 2232. By comparing the location of the LDB in absolute color-magnitude diagrams with standard models, an age of 38 +/- 3 Myr was inferred. Models incorporating high levels of magnetic activity and starspot coverage fractions >50 percent showed the best agreement between LDB and CMD ages, particularly at ages of 45-50 Myr.
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 percent, although a uniformly high spot coverage does not match the CMD well across the full luminosity range considered.
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