We report the observations of X-ray oscillations during the flare in a cool active star ξ Boo for the first
time. ξ Boo was observed by EPIC/MOS of the XMM-Newton satellite. The X-ray light curve is in-
vestigated with wavelet and periodogram analyses. Both analyses clearly show oscillations of the period
of ∼1019 s. We interpret these oscillations as a fundamental fast-kink mode of magnetoacoustic waves.
Description:
This article published in the Astrophysical Journal in 12 May 2009
