| Issue |
A&A
Volume 376, Number 1, September II 2001
|
|
|---|---|---|
| Page(s) | L13 - L16 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20011023 | |
| Published online | 15 September 2001 | |
Detection of differential rotation in ψ Cap with profile analysis*
1
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
2
European Southern Observatory, Casilla 19001, Vitacura, Santiago 19, Chile
Corresponding author: A. Reiners, areiners@hs.uni-hamburg.de
Received:
8
June
2001
Accepted:
16
July
2001
We report detection of differential rotation on the F5
dwarf ψ Cap using line profile analysis. The Fourier
transform of both Fe i
λ5775 and
Si i
λ5772 are used to obtain a projected
rotational velocity of 
km s-1.
Modelling of the Fourier transformed profiles shows that the
combined effects of equatorial velocity, inclination and
differential rotation dominate the line profile while limb
darkening and turbulence velocities have only minor effects.
Rigid rotation is shown to be inconsistent with the measured
profiles. Modelling the line profiles analogous to solar
differential rotation we find a differential rotation parameter
of 
(
% ) comparable to
the solar case. To our knowledge this is the first successful
measurement of differential rotation through line profile
analysis.
Key words: methods: data analysis / stars: activity / stars: individual: ψ Cap / stars: late-type / stars: rotation
© ESO, 2001
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