White-light oscillations during a flare on II Peg.

Details White-light oscillations during a flare on II Peg. White-light oscillations during a flare on II Peg.

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403.1101m&link_type=abstract

Astronomy and Astrophysics, v.403, p.1101-1104 (2003)

Astronomy and Astrophysics

Astrophysics

45

Waves, Stars: Flare, Stars: Binaries: Spectroscopic, Stars: Oscillations, Stars: Magnetic Fields

Scientific paper

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.

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