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Simultaneous X-ray and optical monitoring of the flare star YZ CMi.
Doyle, J. G.; Rodono, M.; Butler, C. J. +1 more
Broad-band photometric observations of YZ CMi show a 1.2 mag U-band flare, however, simultaneous X-ray observations from EXOSAT show no detectable increase. It is suggested that the event could have occurred low down in a part of the chromosphere, which may not have been coupled to the transition region and corona via magnetic fields. However, a m…
X-ray and optical observations of a dMe flare star in the T Tauri field.
Charles, P. A.; Jordan, C.; Walter, F. +3 more
The authors present observations of a newly discovered dMe flare star within 20 pc of the Sun. An EXOSAT observation of this source shows an almost complete X-ray flare light curve with rise time ≡600 s, decay time ≡1500 s, and peak luminosity Lx = 6.1×1029erg s-1, a 40-fold increase in brightness over the quiescen…
IUE observations of the highly luminous Seyfert galaxy ESO 113-IG45 (Fairall 9).
Penston, M. V.; Moles, M.; Masegosa, J.
Ultraviolet variations of the continuum in ESO 113-IG45 with a doubling time of 50 days indicate a maximum size of 1×1017cm to the emitting region. Power law and blackbody fits to the continuum are both possible. The power-law fit is preferred because of the observed correlation between flux and spectral index which is similar to that f…