SIMBAD references

We have measured the equivalent width (EW) of the K I 7699Å line in a sample of G and K-type members of the ∼35 Myr old cluster IC 2602 for which a dispersion in Li EWs had been reported by previous studies. Active cluster stars with 0.75≲B-V₀≲1 are characterized by a dispersion in the EW of the K I 7699Å, while earlier and later-type stars do not show any significant scatter. Cluster stars at all colors show potassium EW excesses with respect to field inactive stars; furthermore, a statistically significant relationship is found between differential potassium EWs and logL_X/ L_bol ratios, indicating that the EWs of the potassium feature are altered by activity. Our results suggest that the dispersion in Li EWs observed among cluster stars later than B-V₀∼1 cannot be fully explained by the effects of activity. No final conclusion can instead be drawn for earlier-type stars.