Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9740d&link_type=abstract
HST Proposal ID #9740
Computer Science
Hst Proposal Id #9740 Ism And Circumstellar Matter
Scientific paper
We propose to undertake a SNAP program of WFPC2 imagery of several planetary nebulae and extragalactic HII regions with the F185W filter to study the spatial variation of the CIII] 1909 Angstrom emission lines across the nebulae. Much of our current knowledge of carbon abundances in planetary nebulae and HII regions are based on UV spectroscopic observations of this line yet there have not been any studies of its spatial variations in nebulae compared to several of the prominent optical lines {e.g. [OIII] 5007 Angstroms}. Such observations, coupled with photoionization modeling of the nebulae, will enable us to assess the utility of using the CIII] line in abundance calculations of C/O and C/H in nebulae and possibly permit improved empirical emission-line diagnostic techniques for ionization corrections to get the elemental carbon abundances from C++/O++ observations based on CIII]/[OIII] 1909/5007. We also plan to study the spatial variation of the CIII] 1909 Angstrom collisionally excited lines against the CII 4267 Angstrom permitted line in many of the nebulae using previous and planned ground-based longslit echelle spectroscopy coupled with the HST WFPC2 F185W imagery.
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