Документ взят из кэша поисковой машины. Адрес оригинального документа : http://star.arm.ac.uk/~ambn/abstract258.html Дата изменения: Fri Dec 20 17:32:00 1996 Дата индексирования: Tue Oct 2 00:18:15 2012 Кодировка: Поисковые слова: hawaii

We present contemporaneous EUV and radio observations obtained for the totally eclipsing chromospherically active RS CVn-type binary CF Tucanae. Observations were made with the ATNF Compact Array at 6 cm and 3.6 cm over one complete orbital cycle of the system and with the EUVE Deep Survey/Spectrometer telescope over five orbital cycles. We obtained a strong detection of the source (1.9 mJy at 6 cm and 1.1 mJy at 3.6 cm) in the radio. Both EUV and radio flux levels appear to show a clear moduation at the orbital period with a maximum at phase 0.5 which indicated the existence of an intra-binary region of activity. This has important consequences for the details of coronal formation and field interaction in active close binary stars. We interpret the EUV emission shows evidence of intrinsic gyromagnetic directivity. We also demonstrate that contemporaneous EUV and radio observations are not sufficent to determine the characteristics of the gyroemission electron population.