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)

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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