Dynamic phenomena on the RS Canum Venaticorum binary II Pegasi in August 1989. II - an interpretation

Astronomy and Astrophysics – Astrophysics

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Binary Stars, Satellite Observation, Stellar Flares, Stellar Radiation, X Ray Spectra, Emission Spectra, Radiant Cooling

Scientific paper

An analysis of the quiescent X-ray and radio observations and of the X-ray observations of a major flare of II Pegasi is presented. For both the flare and the quiescent emission, photometric, and spectroscopic optical data are also discussed. The quiescent X-ray emission shows a power-law tail up to 18 keV. It is shown that an interpretation in terms of free-free emission by nonthernal particles requires unrealistically large values for the number of particles involved and for the energy input required to maintain the population. Basic flare parameters like volume, loop length, and typical magnetic field strength are derived. The observed flare decay on II Peg is compared with the observed flare decay on Sigma CrB and Algol. It is shown that the behavior of the temperature and emission measure during the II Peg flare differs significantly from the observed behavior during the Algol/sigma CrB flares.

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