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Fig. 5


Equivalent width of the Li Iλ6707.8 line (WLi) plotted as a function of the dereddened Johnson color index for the single or SB1 stars in our sample (Table A.4). The lines show the upper boundariesfor Hyades (blue dash-dotted), Pleiades (red solid for both lower and upper boundary), and IC 2602 (orange dashed) clusters. The black dashed line indicates the lower limit for positive detection of the Li I λ6707.8 line estimated by us (10 mÅ). Twenty-nine stars (red big dots) show lithium equivalent width in excess with respect to the most lithium rich Pleiades stars and 10 of the stars fall above the upper envelope of the PMS cluster IC 2602. Four stars (green triangles) have WLi just below the Pleiades upper envelope. The open squares enclose another 11 very young objects selected on the basis of their lithium abundance (see text and Fig. 6). All the lithium-rich stars are labeled according to Table 3.

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