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IRAS 20319+3958 in Cygnus X South is a rare example of a free-floatingglobule (mass ~240 Msun, length ~1.5 pc) with an internal HII region created bythe stellar feedback of embedded intermediate-mass stars, in particular, oneHerbig Be star. Here, we present a Herschel/HIFI CII 158 mu map of the wholeglobule and a large set of other FIR lines (mid-to high-J CO lines observedwith Herschel/PACS and SPIRE, the OI 63 mu line and the CO 16-15 line observedwith upGREAT on SOFIA), covering the globule head and partly a position in thetail. The CII map revealed that the whole globule is probably rotating. Highlycollimated, high-velocity CII emission is detected close to the Herbig Be star.We performed a PDR analysis using the KOSMA-tau PDR code for one position inthe head and one in the tail. The observed FIR lines in the head can bereproduced with a two-component model: an extended, non-clumpy outer PDR shelland a clumpy, dense, and thin inner PDR layer, representing the interfacebetween the HII region cavity and the external PDR. The modelled internal UVfield of ~2500 Go is similar to what we obtained from the Herschel FIR fluxes,but lower than what we estimated from the census of the embedded stars.External illumination from the ~30 pc distant Cyg OB2 cluster, producing an UVfield of ~150-600 G0 as an upper limit, is responsible for most of the CIIemission. For the tail, we modelled the emission with a non-clumpy component,exposed to a UV-field of around 140 Go.

Globules and pillars in Cygnus X III. Herschel and upGREAT/SOFIA far-infrared spectroscopy of the globule IRAS 20319+3958 inCygnus X