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We present CS $J = 2 \to 1$, $^{13}$CO $J = 1 \to 0$, and C$^{18}$O $J = 1\to 0$, observations with the 10-element Berkeley Illinois Maryland Association(BIMA) Array toward the young cluster around the Be star MWC 1080. Theseobservations reveal a biconical outflow cavity with size $\sim$ 0.3 and 0.05 pcfor the semimajor and semiminor axis and $\sim$ 45$\arcdeg$ position angle.These transitions trace the dense gas, which is likely the swept-up gas of theoutflow cavity, rather than the remaining natal gas or the outflow gas. The gasis clumpy; thirty-two clumps are identified. The identified clumps areapproximately gravitationally bound and consistent with a standard isothermalsphere density, which suggests that they are likely collapsing protostellarcores. The gas kinematics suggests that there exists velocity gradientsimplying effects from the inclination of the cavity and MWC 1080. Thekinematics of dense gas has also been affected by either outflows or stellarwinds from MWC 1080, and lower-mass clumps are possibly under stronger effectsfrom MWC 1080 than higher-mass clumps. In addition, low-mass cluster memberstend to be formed in the denser and more turbulent cores, compared to isolatedlow-mass star-forming cores. This results from contributions of nearby formingmassive stars, such as outflows or stellar winds. Therefore, we conclude thatin clusters like the MWC 1080 system, effects from massive stars dominate thestar-forming environment in both the kinematics and dynamics of the natal cloudand the formation of low-mass cluster members. This study provides insightsinto the effects of MWC 1080 on its natal cloud, and suggests a differentlow-mass star forming environment in clusters compared to isolated starformation.

Dense Molecular Gas In A Young Cluster Around MWC 1080 -- Rule Of The Massive Star