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Meridional Circulation, Turbulence and Lithium in Sub-Giants Originating from the Hot Side of the Dip

  • Suzanne Talon (a1) and Corinne Charbonnel (a2)

Abstract

We present the impact of meridional circulation and shear turbulence on the evolution of the lithium abundance at the surface of evolved stars originating from the hot side of the Li Dip. We show that our fully consistent treatment of the same hydrodynamical processes which can account for C and N anomalies in B type stars (Talon et al. 1997) and for the shape of the hot side of the Li dip in open clusters (Talon & Charbonnel 1998) also explains Li observations in stars with Teff higher than 7000K on the main sequence as well as in their evolved counterparts (see also Charbonnel & Talon 1999).

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References

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Burkhart, C., Coupry, M.F., 1998, A&A 338, 1073
Burkhart, C., Coupry, M.F., 2000, A&A, accepted
Charbonnel, C., Talon, S., 1999, A&A, 351, 635
Lèbre, A., de Laverny, P., De Medeiros, J.R., Charbonnel, C., da Silva, L., 1999, A&A 345, 936
Talon, S., Charbonnel, C., 1998, A&A, 335, 959
Talon, S., Zahn, J.P., Maeder, A., Meynet, G., 1997, A&A 322, 209
Talon, S., Zahn, J.P., 1997, A&A 317, 749
Wallerstein, G., Bohn-VItense, E., Vanture, A.D., Gonzalez, G., 1994, AJ, 107, 221
Zahn, J.-P., 1992, A&A 265, 115

Meridional Circulation, Turbulence and Lithium in Sub-Giants Originating from the Hot Side of the Dip

  • Suzanne Talon (a1) and Corinne Charbonnel (a2)

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