PHYSICAL CONDITIONS IN NEUTRAL GAS ATMOSPHERE OF P-HALLEY (1986 III) ON THE BASIS OF SPECTRAL OBSERVATIONS

On the basis of over 40 spectra of comet P/Halley (1986 III) obtained with the 1 m Zeiss reflector and the image-converter tube camera in As sy physical parameters of cometary gas (Q is the gas production, tau i s the lifetime and upsilon is the velocity of molecules C2, C3 and CN in the neutral coma) were obtained. The low velocities of the CN molec ules compared to the velocities of C2 and C3 molecules are probably co nnected to the presence of the extensive source of parental molecules, from the latter as a result of photodissociation CN molecules being g enerated (CN-jets, CHON-particles).