Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1B076

No evidence for intense, cold accretion on to YSOs from measurements of Li in T-Tauri stars

Sergison, Darryl J. (University of Exeter)
Mayne, N.J. (University of Exeter)
Naylor, Tim (University of Exeter)
Jeffries, R.D. (Keele University)
Bell, Cameron P.M. (University of Exeter)

Abstract:
Models suggest that strong depletion of lithium in T Tauri stars might be evidence for the occurrence of accretion at high rates (dM/dt > 5 × 10−4 M⊙ yr−1) during their `assembly phase’ prior to the T Tauri phase. In Sergison et al. (2013MNRAS.434..966S) we find no evidence for unexpected lithium depletion in veiling- corrected spectra of 168 stars in NGC 2264 and the Orion Nebula Cluster. This suggests that `cold’ accretion at high rates occurs in fewer than 0.5% of 0.3 < M⋆ /M⊙ < 1.9 young-stellar objects.

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