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Symbiotic stars are eccellent laboratories to study a broad range of poorlyunderstood physical processes, such as mass loss of red giants, accretion ontocompact objects, and evolution of nova-like outbursts. As their evolution isstrongly influenced by the mass transfer episodes, understanding the history ofthese systems requires foremost to determine which process is at play: Rochelobe overflow, stellar wind accretion, or some more complex mixture of both. Wereport here an interferometric study of the symbiotic system SS Leporis,performed with the unique PIONIER instrument. By determining the binary orbitand revisiting the parameters of the two stars, we show that the giant does notfill its Roche lobe, and that the mass transfer most likely occurs via theaccretion of an important part of the giant's wind.

A PIONIER and incisive look at the interacting binary SS Lep