Spatially-resolved Spectroscopy of C/2002 C1 (Ikeya-Zhang) with HST

Details Spatially-resolved Spectroscopy of C/2002 C1 (Ikeya-Zhang) with HST Spatially-resolved Spectroscopy of C/2002 C1 (Ikeya-Zhang) with HST

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dps....34.1204w&link_type=abstract

American Astronomical Society, DPS Meeting #34, #12.04; Bulletin of the American Astronomical Society, Vol. 34, p.853

Astronomy and Astrophysics

Astronomy

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Scientific paper

The Hubble Space Telescope (HST) was used to observe C/2002 C1 (Ikeya-Zhang) for 9 orbits during 2002 April 20-23 UT when the comet's heliocentric distance was 0.9 AU and the geocentric distance was 0.4 AU. Spectral images taken with the Space Telescope Imaging Spectrograph (STIS) show cometary emissions from H, O, C, S, CO (4PG and Cameron bands), C 2 (Mulliken bands), CS, S 2, OH, and NH at a spatial resolution better than 0.1 arcsec. The large gas production rate of this comet (Q H2O ~ 2.3 x 1029), together with the excellent spatial resolution and pointing accuracy of the HST observations, permit a detailed investigation of the spatial brightness profiles of all species in the inner coma. In addition to allowing more accurate determinations of gas production rates, the spatial profiles provide information on the lifetime and source of S 2, the lifetime of the parent of CS, and constraints on the source of CO. Preliminary abundance ratios derived from the STIS spectra are H2O:CO:S 2:CS 2 = 100:8:0.0037:0.1. We gratefully acknowledge financial support from NASA through grant number HST-GO-09496.01 from the STScI, which is operated by AURA under NASA contract NAS5-26555.

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