Knowledge Bank

As a well known cluster system that has simultaneous low and high-mass star formation, the $BD+40\circ 4124$ region can provide an interesting laboratory for star formation studies. The cluster associated with $BD+40\circ 4124$, a Herbig Be star at a distance of 1 kpc, includes two other optically visible young stars, V 1686 Cygni and V1318 Cygni, and several embedded IR sources. We present the BIMA interferometric images of CS $J=2-1,\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}COJ=1-0$, and $C18OJ=1-0$ to probe the molecular gas distribution and morphology and derive the gas column density and molecular mass. By comparsion with near infrared observations, we identify more embedded sources showing ongoing star-forming activities and study the formation mechanism and interaction between the high mass star and low mass companions. Finally, the impact to general star formation will be discussed.