| Issue |
A&A
Volume 466, Number 2, May I 2007
|
|
|---|---|---|
| Page(s) | L13 - L16 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20077095 | |
| Published online | 05 March 2007 | |
Letter to the Editor
Rapid magnetic flux variability on the flare star CN Leonis*
1
Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany e-mail: [jschmitt;cliefke]@hs.uni-hamburg.de
2
Universität Göttingen, Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany e-mail: Ansgar.Reiners@phys.uni-goettingen.de
Received:
15
January
2007
Accepted:
28
February
2007
We present UVES/VLT observations of the nearby flare star CN Leo covering the Wing-Ford FeH band near 1 μm with high spectral resolution. Some of the FeH absorption lines in this band are magnetically sensitive and allow a measurement of the mean magnetic flux on CN Leo. Our observations, covering three nights separated by 48 hours each, allow a clear detection of a mean magnetic field of Bf ≈ 2.2 kG. The differential flux measurements show a night-to-night variability with extremely high significance. Finally, our data strongly suggest magnetic flux variability on time scales as low as 6 hours in line with chromospheric variability.
Key words: stars: activity / stars: late-type / stars: magnetic fields / stars: individual: CN Leo
© ESO, 2007
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