Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3372g&link_type=abstract
HST Proposal ID #3372
Physics
Hst Proposal Id #3372
Scientific paper
Knowledge of the point-spread-function (PSF) for large (LSA) aperture GHRS is essential for any quantitative analysis of spectra taken through the LSA. With the determination that the GHRS has better far UV response than the FOS, coupled with simulations showing that the LSA is superior to the SSA for detection of weak, unresolved features, the need for good PSFs has increased in importance. This is independent of any deconvolution issues. Deconvolution, which may in some cases be a useful procedure to apply to LSA spectra, also requires knowledge of the PSF. Good SSA PSFs can be derived using calibration lamp spectra and simple modelling. Unfortunately, GHRS LSA maps have not proven sufficient to derive point-spread-functions (only N1 picks off the full beam). The SAO observations of CHI LUPI were justified as a test of GHRS resolving power, LSA degradation and deconvolution testing. Analysis of this data, coupled with many simulations, has shown that the best approach to deriving the relative PSF difference between the LSA and SSA is by direct least-squares solution for the PSF relating spectra acquired through the two apertures. With a vsini < 1.2 km/sec, CHI LUPI is an ideal target to define PSFs over the full range of spectral elements.
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