Observations of X-Ray Oscillations in ξ Boo: Evidence of a Fast-Kink Mode in the Stellar Loops
Abstract
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 investigated 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2009
- DOI:
- 10.1088/0004-637X/697/2/L153
- arXiv:
- arXiv:0904.4084
- Bibcode:
- 2009ApJ...697L.153P
- Keywords:
-
- stars: activity;
- stars: coronae;
- stars: flare;
- MHD;
- waves;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- ApJL, 5 pages, 3 figures, 2 tables, after proof corrections
