Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9178h&link_type=abstract
HST Proposal ID #9178
Mathematics
Logic
Hst Proposal Id #9178 Ism And Circumstellar Matter
Scientific paper
While it is commonly thought that photoionized gases are well understood and that codes that model them have been tested exhaustively, this is not the case. Tests have been spotty and are undermined by the morphological complexity revealed by HST. It has proved difficult to model high-T, high-excitation objects. There is a fundamental need for clean observational tests of our photoionization codes. NGC 2610 is a high- excitation planetary nebula which, even at HST resolution, is smooth and symmetric. Due to its high ionization - helium is He^++ throughout - it has a meager optical spectrum. But its high electron temperature {18, 000 K} results in very strong ultraviolet lines. It is the best object we know of to test the performance of photoionization codes without the complication of morphological substructures. With a radius of 18", STIS long-slit observations will provide excellent spatial resolution to test against models. We propose STIS observations with a wide slit to observe lines of H I, He II, C III, C IV, N IV, N V, O III, O IV, Ne III, Ne IV, and Ne V from 1240Angstrom to 6563Angstrom. He II Lambda1640/Lambda4686 will determine the {small} reddening accurately. These observations will provide a benchmark against which we can test our understanding of high T_e nebulae, which are ubiquitous in low abundance environments, but which have proved difficult to model.
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