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

Solar and Stellar Astrophysics