A study of three massive star-forming regions in CS lines

We have mapped three star-forming regions (G265.14 + 1.45, G269.16-1.14, G291.27-0.71 in the CS(3-2) and C-34 S(2-1) lines using the 15 in SEST telescope Chile), and analyzed the relative positions of methanol and H2O masers, WAS sources, and emission maxima ill the CS lilies. In most cases, the maser positions are close to those of the WAS sources. We compared the radial velocities of the Maser Sources and high-density CS cores, and estimated the CS column densities assuming LTE. The sizes, densities, and masses of the dense core are estimated, the masses obtained in the LTE approximation agree with the virial masses.