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This behaviour can be interpreted in terms of an X-ray emitting plasma located near the O star, but not fully intrinsic to it, and accompanying the star when it dives into the wind of the WR component.

A model is presented that interprets most of the observational constraints.

Oh that explains why an empty preview window was shown and a print requested. They are file Print Preview(), file Print() and print(QPrinter *printer). I read that a QPainter is almost always created inside a paint Event() and I guess this is why I couldn't create one inside my file Print Preview() slot.

I simply thought the print slot had nothing to do with the preview and ignored its connect. Moving the lines makes it possible to preview the widget. Why can I create a QPainter inside the print(...) slot? I understand I request painting but shouldn't the widget's paint Event() handle such requests?

All QWidgets are QPaint Devices so by far the majority of painting is done in QWidget::paint Event() to render your UI.You can use the same slot to service a print immediately function by simply passing a real QPrinter.Your existing code prints to the system default printer every time it is called and ignores the preview.This model suggests that the mass-loss rate of yr assumed for the WR could still be slightly too high, whereas it is already lower than other published values. Main orbital elements of WR 22 from the two most recent solutions.From the comparison of the observed and the expected absorptions at phases near periastron, we deduce that the hard X-ray emitting collision zone should at least have a typical size of 50-60 , but that the size for the soft X-ray emitting region could reach 244 if the assumed mass-loss rate is correct. Among the first early-type stars detected by EINSTEIN in the Carina region, two WR stars were already present (WR 25, Seward et al. Although some WR stars seem to be intrinsic X-ray emitters (see e.g. 1995), the actual situation is less clear than for the O type stars.

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