Osservatorio Astrofisico di Arcetri, Largo Fermi 5, 50125 Firenze, Italy
Corresponding author: S. Randich, email@example.com
Accepted: 23 July 2001
We have measured the equivalent width (EW) of the K i 7699 Å 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 are characterized by a dispersion in the EW of the K i 7699 Å, 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 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 cannot be fully explained by the effects of activity. No final conclusion can instead be drawn for earlier-type stars.
Key words: open clusters and associations: individual: IC 2602 / stars: abundances / stars: interiors
© ESO, 2001