STUDIES OF DENSE MOLECULAR CORES IN REGIONS OF MASSIVE STAR-FORMATION.2. CS J=2-1 SURVEY OF SOUTHERN H2O MASERS IN THE LONGITUDE RANGE L=260-DEGREES-310-DEGREES

We searched for the CS J = 2-1 emission towards 30 southern H2O and OH masers with the SEST radio telescope (29 H2O and H2O/OH masers and 1 OH maser). We detected and mapped 24 CS emitting regions associated pr obably with 27 H2O masers. The (CS)-S-34 J = 2-1 and CO J = 1-0 lines were also observed at the grid positions closest to the CS peaks. Here we present the CS maps and the spectra at the peak positions along wi th the CO and (CS)-S-34 spectra. We derive the (CS)-S-34 column densit ies in the LTE approximation and discuss briefly the spatial and kinem atic structure of the sources. The association with the IRAS point sou rces and small scale structure sources is examined. We estimate the ki nematic distances to the cores and derive their sizes, masses and mean densities. The velocity differences between the masers and CS cores a re analyzed. The CO and CS spectra towards several sources demonstrate deep absorption features. We argue that they can be due to extended l ow excitation foreground cloud(s).