Image Details
Caption: Figure 8.
Left: Li abundance relative to the initial level predicted by the DSEP magnetic models for two different solar abundance scales (dashed and solid lines), with colors corresponding to different times. The existence of a significant drop in the Li levels without a full depletion limits an association’s age to 8–14 Myr, depending on the assumed abundance scale (Grevesse & Sauval 1998; Asplund et al. 2009). Right: lithium equivalent width of TOI 1227 (red) and its kinematic neighbors measured from Goodman (green star) or high-resolution ESO archival spectra (blue star). We compare this to the sequence from ϵ Cha (purple; Murphy et al. 2013) and β Pic (gray; Shkolnik et al. 2017). Arrows indicate upper limits. ϵ Cha shows a clear sequence, while β Pic shows full Li depletion around M2–M4. The stars associated with TOI 1227 show a dip around M3, but not a full depletion, bracketing the age between the two groups (5 and 24 Myr). The top axis of both plots shows estimated spectral types.
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