SIMBAD references

2001A&A...377..512R - Astronomy and Astrophysics, volume 377, 512-521 (2001/10-2)

On the dispersion in lithium and potassium among late-type stars in young clusters: IC 2602.


Abstract (from CDS):

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 logLX/ Lbol 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.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: IC 2602 - stars: abundances - stars: interiors

Simbad objects: 33

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