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The peculiar emission-line star MWC 137 with its extended optical nebula wasrecently classified as B[e] supergiant. To study the spatial distribution ofits circumstellar molecular gas on small and large scales, we obtainednear-infrared and radio observations using SINFONI and APEX, respectively. Wefind that the hot CO gas is arranged in moving clumpy ring and shell structuresclose to the star, while a cold CO envelope is encircling the borders of theoptical nebula from the south to the west.

Clumpy molecular structures revolving the B[e] supergiant MWC 137