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We have carried out a comprehensive study of the molecular conditions andstar-forming activities in dark cloud L1174 with multi-wavelength data. Mappingobservations of L1174 in $^{13}$CO $J=2-1$ and $^{12}$CO $J=3-2$ were performedusing the KOSMA 3-meter telescope. Six molecular cores with masses ranging from5 to 31 $M_\odot$ and sizes ranging from 0.17 to 0.39 pc are resolved. Largearea ahead of a Herbig Be star, HD 200775, is in expanding and core 1 is withcollapse signature. Large line widths of $^{13}$CO $J=2-1$ indicate theubiquity of turbulent motions in this region. Spectra of $^{12}$CO $J=3-2$prevalently show conspicuously asymmetric double-peaked profiles. In a largearea, red-skewed profiles are detected and suggestive of a scenario of globalexpansion. There is a large cavity around the Herbig Be star HD 200775, thebrightest star in L1174. The gas around the cavity has been severely compressedby the stellar winds from HD 200775. Feedbacks from HD 200775 may have helpedform the molecular cores around the cavity. Seventeen 2MASS potential youngstellar objects were identified according to their 2MASS colour indices. Thespatial distribution of the these 2MASS sources indicates that some of themhave a triggered origin. All these suggest that feedbacks from a Herbig Ae/Bestar may also have the potential to trigger star forming activities.

A mapping study of L1174 with 13CO J=2-1 and 12CO J=3-2: star formation triggered by a Herbig Ae/Be star