Volume 403, Number 3, June I 2003
|Page(s)||1101 - 1104|
|Published online||23 May 2003|
White-light oscillations during a flare on II Peg
Department of Pure and Applied Physics, Queens University Belfast, Belfast BT7 1NN, Northern Ireland, UK
2 University of Thessaloniki, Department of Physics, Section of Astrophysics Astronomy and Mechanics, 54124 Thessaloniki, Greece
3 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK
Corresponding author: M. Mathioudakis, M.Mathioudakis@qub.ac.uk
Accepted: 11 March 2003
We analyse the intensity oscillations observed in the gradual phase of a white-light flare on the RS CVn binary II Peg. Fast Fourier Transform power spectra and Wavelet analysis reveal a period of 220 s. The reliability of the oscillation is tested using several criteria. Oscillating coronal loop models are used to derive physical parameters such as temperature, electron density and magnetic field strength associated with the coronal loop. The derived parameters are consistent with the near-simultaneous X-ray observations of the flare. There is no evidence for oscillations in the quiescent state of the binary.
Key words: waves / stars: flare / stars: binaries: spectroscopic / stars: oscillations / stars: magnetic fields
© ESO, 2003
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