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K. I. Churyumov, V. V. Kleshchonok (Kyiv National University, Ukraine)
For the first time a luminescence continuum was detected in the comet Halley (1P) spectrum by G. Nazarchuk in 1987. The authors investigated spectra of four comets with the aim to determine the real level of the non-solar origin continuum in the spectral region 350-500 nm. Spectra of three comets Schaumasse (24P), Scoritchenko-George (C/1989 Y1) and Hale-Bopp (C/1995 O1) were observed with the help of the 6-m BTA telescope and the spectrograph with the long slit at the Special Astrophysical Observatory of the Russian Academy of Sciences. Spectra of comet Hale-Bopp (C/1995 O1) also were obtained with the 1-meter Zeiss telescope and eshelle-spectrometer of the SAO RAS. As a result of processing the cometary spectra we obtained: 1) For comet Schaumasse (24P) March 14-15, 1993 the level of the non-solar-origin continuum equal to 44% of the sum continuum level at 430 nm; 2) For comet Scoritchenko-George (C/1989 Y1) February 27, 1990 the level of the non-solar-origin continuum equal to 40% of the sum continuum level at 387 nm, 68% - at 430 nm (max) and 23% - at 480 nm; 3) For comet Hale-Bopp (C/1995 O1) April 17, 1997 the level of the non-solar-origin continuum equal to 32% of the sum continuum level at 397 nm and 77% - at 438 nm. We suppose that in spectra of comets Schaumasse (24P), Scoritchenko-George (C/1989 Y1) and Hale-Bopp (C/1995 O1) we detected the real cometary continuum tied with the luminescence of the comet organic spices which are in comet dust particles.