Spectra Of Split Comet C/1999 S4 (Linear)

Details Spectra Of Split Comet C/1999 S4 (Linear) Spectra Of Split Comet C/1999 S4 (Linear)

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002em%26p...90..141c&link_type=abstract

Earth, Moon, and Planets, v. 90, Issue 1, p. 141-146 (2002).

Physics

Comets, Continuum, Luminescence, Nucleus, Spectra, Splitting

Scientific paper

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. On July 22/23, before the splitting of the cometary nucleus, several emission lines, such as C2, C3, CN, NH, CH, NH2, CO+, H2O+ were clearly identified in the spectra. The inspections of the CCD spectra obtained on July 27/28, 2000 reveals only very weak emission lines superimposed on the solar 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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