Rapid magnetic flux variability on the flare star CN Leonis

Details Rapid magnetic flux variability on the flare star CN Leonis Rapid magnetic flux variability on the flare star CN Leonis

2007-03-08

arxiv.org/abs/astro-ph/0703172v1

Astronomy and Astrophysics

Astrophysics

4 pages, accepted for publication as A&A Letter

Scientific paper

10.1051/0004-6361:20077095

We present UVES/VLT observations of the nearby flare star CN Leo covering the Wing-Ford FeH band near 1mu 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~2.2kG. 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.

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