The study of multi-band radio observations on ultraviolet flares of chromospheric active binary V711 Tauri |
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Authors: | Bumei Su R L Mutel Yongsheng Li Hujun Zhang |
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Institution: | (1) Yunnan Observatory, Chinese Academy of Sciences, Kunming, China;(2) Department of Physics and Astronomy, Iowa University, USA;(3) Yunnan Observatory, Chinese Academy of Sciences, Kunming, China;(4) Shanghai Observatory, Chinese Academy of Sciences, Shanghai, China |
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Abstract: | The chromospherically-active binary, V711 Tau, had been observed by using the American Very Large Array (VLA) at five bands from 1.4 to 15 GHz. During the observation, the source was undergoing an intense flare, its radio luminosity up to 1.8 × 1018 erg s–1 Hz–1. The degree of circular polarization in the phase of the most intense flare was very small. With the decaying of the flare the flux density decreased, spectral index became smaller, spectra steeper and reversal frequency lower; the degree of circular polarization increased and its direction was dependent on frequency. These observational facts support the conclusion that the emission during intense flare is synchrotron (or synchro-cyclotron) mechanism. The magnetic intensity is about 10 G near = 1, the average electron energy, 4 MeV, the electron density with larger than 10 keV, 3 × 104–9 × 104 cm–3 and the electronic energy spectrum index in power-law distribution 1.3. |
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