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The X-Ray Orbital Lightcurve of AR Lac

Parmar, A. N.; White, N. E.; Culhane, J. L. +1 more

Using the EXOSAT observatory we have obtained the X-ray light curve of the 2 day eclipsing RS CVn binary system AR Lac continuously around one complete binary cycle. A deep minimum centered on primary eclipse is seen in the low energy telescope (0.05-2.0 keV), whereas the ME (1.0-10.0 keV) flux remained constant. This shows that the 5-7 million an…

X-ray and optical observations of the flare star Wolf 630 AB and of VB 8 G.

Tagliaferri, G.; White, N. E.; Doyle, J. G. +1 more

Results from three EXOSAT observations of Wolf 630 AB are reported. Two X-ray flares have been detected, one simultaneous with an Hα flare. During the second observation a large increase in the X-ray flux from the nearby star VB 8 was also detected.

A Large X-ray Flare on σ² Coronae Borealis Observed with EXOSAT

Mewe, R.; Brinkman, A. C.; van den Oord, G. H. J.

We report the observation of a compact flare on σ² Coronae Borealis. The energy requirements for the flare are discussed and we find that current-driven turbulence can produce heating fast enough. During the initial phase of the flare classical transport theory is not applicable.