Abstract
With the 30-m IRAM radio telescope, we observed several massive star forming regions at wavelengths of 3-4 and 2 mm. The temperature of the gas in the sources was estimated from the lines of CH3CCH and from the transitions of the NH3 molecule obtained during observations at the 100-m radio telescope in Effelsberg. As a result, a correlation between the integrated intensity ratios of the J = 1-0 transitions of (HCN)-C-13-(HNC)-C-13 and the kinetic temperature has been obtained. The obtained results allow us to propose the use of the intensity ratio (HCN)-C-13-(HNC)-C-13 as a possible temperature indicator of interstellar clouds. We also compared the obtained estimates of the kinetic temperature T-dust temperature . As a result, no T dust significant correlation was found.