| Issue |
A&A
Volume 377, Number 2, October II 2001
|
|
|---|---|---|
| Page(s) | 512 - 521 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20011079 | |
| Published online | 15 October 2001 | |
On the dispersion in lithium and potassium among late-type stars in young clusters: IC 2602 *
Osservatorio Astrofisico di Arcetri, Largo Fermi 5, 50125 Firenze, Italy
Corresponding author: S. Randich, randich@arcetri.astro.it
Received:
23
January
2001
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.