The Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars

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dc.contributor.authorJeffries R.D.
dc.contributor.authorJackson R.J.
dc.contributor.authorFranciosini E.
dc.contributor.authorRandich S.
dc.contributor.authorBarrado D.
dc.contributor.authorFrasca A.
dc.contributor.authorKlutsch A.
dc.contributor.authorLanzafame A.C.
dc.contributor.authorPrisinzano L.
dc.contributor.authorSacco G.G.
dc.contributor.authorGilmore G.
dc.contributor.authorVallenari A.
dc.contributor.authorAlfaro E.J.
dc.contributor.authorKoposov S.E.
dc.contributor.authorPancino E.
dc.contributor.authorBayo A.
dc.contributor.authorCasey A.R.
dc.contributor.authorCostado M.T.
dc.contributor.authorDamiani F.
dc.contributor.authorHourihane A.
dc.contributor.authorLewis J.
dc.contributor.authorJofre P.
dc.contributor.authorMagrini L.
dc.contributor.authorMonaco L.
dc.contributor.authorMorbidelli L.
dc.contributor.authorWorley C.C.
dc.contributor.authorZaggia S.
dc.contributor.authorZwitter T.
dc.date.accessioned2024-09-03T17:13:11Z
dc.date.available2024-09-03T17:13:11Z
dc.date.issued2017-01
dc.descriptionIndexación: Scopus
dc.description.abstractWe show that non-magnetic models for the evolution of pre-main-sequence (PMS) stars cannot simultaneously describe the colour-magnitude diagram (CMD) and the pattern of lithium depletion seen in the cluster of young, low-mass stars surrounding γ 2 Velorum. The age of 7.5 ± 1 Myr inferred from the CMD is much younger than that implied by the strong Li depletion seen in the cluster M-dwarfs, and the Li depletion occurs at much redder colours than predicted. The epoch at which a star of a given mass depletes its Li and the surface temperature of that star are both dependent on its radius. We demonstrate that if the low-mass stars have radii ~10 per cent larger at a given mass and age, then both the CMD and the Li-depletion pattern of the Gamma Velorum cluster are explained at a common age of ≃ 18- 21 Myr. This radius inflation could be produced by some combination of magnetic suppression of convection and extensive cool starspots. Models that incorporate radius inflation suggest that PMS stars, similar to those in the Gamma Velorum cluster, in the range 0.2 < M/M ⊙ < 0.7, are at least a factor of 2 older and ~7 per cent cooler than previously thought and that their masses are much larger (by > 30 per cent) than inferred from conventional, non-magnetic models in the Hertzsprung-Russell diagram. Systematic changes of this size may be of great importance in understanding the evolution of young stars, disc lifetimes and the formation of planetary systems. © 2016 The Authors.
dc.description.urihttps://academic-oup-com.recursosbiblioteca.unab.cl/mnras/article/464/2/1456/2282853
dc.identifier.doi10.1093/mnras/stw2458
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/59738
dc.language.isoen
dc.publisherOxford University Press
dc.rights.licenseAtribución/Reconocimiento 4.0 Internacional CC BY 4.0 Deed
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectOpen clusters and associations: general
dc.subjectStars: evolution
dc.subjectStars: low-mass
dc.subjectStars: magnetic field
dc.subjectStars: pre-mainsequence
dc.subjectStarspots
dc.titleThe Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars
dc.typeArtículo
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