Non thermal radio emissions from dMe flare stars and the cataclysmic variable AE Aquarii

Details Non thermal radio emissions from dMe flare stars and the cataclysmic variable AE Aquarii Non thermal radio emissions from dMe flare stars and the cataclysmic variable AE Aquarii

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.......129a&link_type=abstract

Ph.D. Thesis, Université Paris 6, France.

Statistics

Non-Thermal, Radio, Dme Flare Stars, Cataclysmic Variables

Scientific paper

We have performed 150 hours of observations of ten UV Ceti-type flare stars ("dMe") and one RS CVn with two very sensitive large radiotelescopes (Arecibo and Nançay), mainly at 21 cm. We have used several spectral analysers (acousto-optical spectrometers) of very wide frequency band, and high time and frequency resolutions. In Arecibo, we have developed a very reliable observing technique discriminating between man-made interference and bursts of stellar origin. We have recorded a dozen of bursts from only one star (AD Leo); these bursts are attributed to a non thermal, coherent emission mechanism, a cyclotron maser instability or plasma radiation: these two possibilities are compatible with what is known for some solar bursts and planetary auroral radio emissions. Furthermore, our results are a first attempt of reliable statistics on dMe flare rates and we compare them with statistics established from previous publications. We have made the first detection of the magnetic cataclysmic vairable AE Aquarii at 3.4 mm with the IRAM interferometer (Plateau de Bure), while centimetric observations were performed during the same period. The long-term average spectrum of the observed radio emission is well fitted by an increasing power-law: by extending it to the millimetric domain, we could then give a more precise value of its spectral index, and we have confirmed a model attributing the radio lfares to the superposition of synchrotron radiation from relativistic electrons that are present in expanding plasma blobs.

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