| Issue |
A&A
Volume 393, Number 3, October III 2002
|
|
|---|---|---|
| Page(s) | L77 - L80 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20021250 | |
| Published online | 01 October 2002 | |
Letter to the Editor
Evidence for strong differential rotation in Li-depleted fast rotating F-stars*
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Corresponding author: A. Reiners, areiners@hs.uni-hamburg.de
Received:
20
July
2002
Accepted:
23
August
2002
We report the detection of strong differential rotation on
ten fast rotating (
km s-1) stars of
spectral types F0–G0 using the Fourier Transform Method, in three
cases we find 
%. Among the six differential
rotators with 
km s-1, five have Li
abundances of log 
, for one object no Li
abundance is available to our knowledge. No differentially rotating
star with high Li abundance was found, although the average Li
abundance of fast rotators in the literature is log 
. Our results suggest that Li-depleted fast rotators tend to
show differential rotation. Interpreting high rotational velocity as
indicator of youth, this finding supports the idea of the connection
between mixing processes and differential rotation during magnetic
breaking in F-stars.
Key words: stars: abundances / stars: evolution / stars: rotation
© ESO, 2002
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