See the main Beta Pictoris page for full details: http://www.pbase.com/rolfolsen/beta_pictoris

I collected 344 images of Beta Pictoris at 7.0 seconds each and 299 images of Alpha Pictoris at 4.0s each. Both sets of images were dark subtracted and stacked separately in Registax. I then subtracted the Alpha image from the Beta image in PixInsight LE, and also created the absolute difference between the two.
The absolute difference image is simply easier to work with, but the subtraction image was important as a reference to examine which of the stars had contributed the various parts of the difference. B
In the subtraction image contributions from Alpha Pictoris are dark, while contributions from Beta Pictoris are light. It is clear that there is a fairly strong signal corresponding to the exact location of the debris disc and that it is coming from the Beta image.