| We present three projects whose goals were to better understand massive star formation. The first images a massive star formation region, W75N, at high resolution in CH3CN emission. We conclude that CH3CN is isolated to the most massive hot core within W75N. The second project explores how the Kelvin-Helmholtz shear-flow instability will behave given the conditions typically present at the outflow-ambient ISM interface. Our principle contribution is to explore how the instability grows in a partially ionized medium. We conclude that the instability should grow such that ion outflow-tracers will have an enhanced velocity-dependence relative to neutral outflow-tracers. The last project analyzes observations of the massive bipolar outflow G5.89--0.39 in CO, 13CO, C18O and HCO+. We characterize the basic outflow properties and do not find evidence of the Kelvin-Helmholtz instability. The ion-neutral velocity difference may be below our detection limit but we are able to conclude that entrainment contributes an important, but not dominant, fraction of the mass in the outflow. |
