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We carried out high-sensitivity spectropolarimetric observations of thecentral star of the Red Rectangle proto-planetary nebula with the aim ofconstraining the mechanism that gives its biconical shape. The stellar light ofthe central binary system is linearly polarised since it is scattered on thedust particles of the nebula. Surprisingly, the linear polarisation in thecontinuum is aligned with one of the spikes of the biconical outflow. Also, theobserved Balmer lines as well as the Ca II K lines are polarised. Theseobservational constraints are used to confirm or reject current theoreticalmodels for the shaping mechanism of the Red Rectangle. We propose that theobserved polarisation is very unlikely generated by a uniform biconical stellarwind. Also, the hypothesis of a precessing jet does not completely match theobservations since it will require a jet aperture larger than that of thenebula.

Constraining the shaping mechanism of the Red Rectangle through spectro-polarimetry of its central star