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Symbiotics are evolved low-mass binaries with a hot
post AGB star as the primary and a RGB star (s-type
symbiotics) or an AGB star (d-type symbiotics) as
the secondary. In many - if not in all - systems
both stars lose mass by stellar winds
of higly different characteristics: the fast, tenous
wind from the primary interacts with the slow, dense
wind from the secondary.
The graph shows the logarithmically color-coded 3D
density structure of the circumstellar material.
The stars are located in the very center of the
computational box (black). In this simulation,
the stellar separation is about 30 times smaller
than the computational box.
More scientfic background can be taken from