Spectra Of Split Comet C/1999 S4 (Linear) |
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| Authors: | Churyumov K I Luk'yanyk I V Vlassyuk V V Borisov N V |
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| Institution: | (1) Astronomical Observatory, Kyiv National Shevchenko University, Kyiv, Ukraine;(2) Special Astrophysical Observatory of RAS, Russia |
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| Abstract: | We obtained spectra of comet C/1999 S4 (LINEAR) with the UAGS spectrograph(long slit and CCD) installed on the 1-m Zeiss reflector of the SAO of the RAS(Northern Caucuses, Nizhny Arkhyz) on July 23/24, 26/27 and 27/28, 2000. OnJuly 22/23, before the splitting of the cometary nucleus, several emission lines,such as C2, C3, CN, NH, CH, NH2, CO+, H2O+ wereclearly identified in the spectra. The inspections of the CCD spectra obtainedon July 27/28, 2000 reveals only very weak emission lines superimposed on thesolar reflection spectrum. From analyzing the surface brightness profile of C2 along the slit the velocity of separation of two secondary fragments (V = 10 km/h) and the energy of the fragment separation (E = 8.7 × 1015 erg) were estimated. A luminescence cometary continuum of 26% of the total continuum level is detected in the spectra of the comet at 5000 Å. Possible mechanisms of nucleus splitting are discussed. |
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| Keywords: | Comets continuum luminescence nucleus spectra splitting |
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