Simultaneous optical, infrared and microwave observations of the flare star AT MIC

Details Simultaneous optical, infrared and microwave observations of the flare star AT MIC Simultaneous optical, infrared and microwave observations of the flare star AT MIC

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220...91n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 1, 1986, p. 91-106.

Astronomy and Astrophysics

Astronomy

21

Binary Stars, Flare Stars, Infrared Astronomy, Microwave Emission, Optical Measurement, Compton Effect, Cosmic Plasma, High Temperature Plasmas, Stellar Models, Synchrotron Radiation

Scientific paper

The first extensive observations of the binary dMe flare star AT Mic made simultaneously at optical, infrared and microwave wavelengths are reported. The observations have failed to show decreases in infrared flux at the time of optical flares. Such decreases are expected if the inverse Compton scattering mechanism proposed by Gurzadyan (1980) is dominant during the flares. On the contrary, one large flare showed a significant increase in the K-band flux consistent with an energy spectrum which is flat, at least in the range from U to K bands. The J-band flux, however, showed no significant average change during a large number of smaller flares. These results are discussed in terms of a number of thermal and nonthermal flare models. It is concluded that the data can be best accounted for in terms of a hot (about 100,000 K) plasma flare model which produces a relatively flat energy-spectrum over a range of wavelengths determined by the temperature, density and depth of the source region. This range may therefore vary from flare to flare and from star to star. Microwave observations during a large number of optical flares indicate a variation of at least several orders of magnitude in the ratio of optical-to-microwave flare luminosities. This is taken to imply that different plasmas are responsible for the two emissions.

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