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B[e] supergiants (B[e]SGs) are emission-line objects, presumably in ashort-lived phase in the post-main sequence evolution of massive stars. Theirintense infrared excess emission indicates large amounts of warm circumstellardust, and the stars were longtime assumed to possess an aspherical windconsisting of a classical line-driven wind in polar direction and a dense, slowequatorial wind dubbed outflowing disk. The general properties obtained forthese disks are in line with this scenario, although current theories haveconsiderable difficulties reproducing the observed quantities. Therefore, moresophisticated observational constraints are needed. These follow from combinedoptical and infrared spectroscopic studies, which delivered the surprisingresult that the circumstellar material of B[e]SGs is concentrated in multiplerings revolving the stars on stable Keplerian orbits. Such a scenario requiresnew ideas for the formation mechanism, in which pulsations might play animportant role.

Spectroscopic diagnostics for circumstellar disks of B[e] supergiants