Thanks Buggs and Johaen
I saw Buggs great Mira add-on a while ago, with a lot of stunning details.
This encourage me to work on my old binary star model.
Moreover, after having read many scientific articles, many nebulas seem to be driven by a binary star system ... M1, and so on
So if I want to be able to release a day, a good M1 add-on I must work on this.
I use barycenter to my system. This way, I manage to make all things orbit together (after dozen of combinaisons

).
I need to do other combinaisons : with jet streams, with gas disk, ...
I hope I'll manage to give news soon
JLL