Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.189a&link_type=abstract
In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 189-192 (SEE N89
Astronomy and Astrophysics
Astronomy
1
Iue, Spaceborne Astronomy, Spatial Resolution, Ultraviolet Astronomy, Ultraviolet Spectra, Globular Clusters, Least Squares Method, Stellar Occultation
Scientific paper
Polystar, a technique whereby spatial information along the dispersion and the cross-dispersion axes of the IUE large aperture can be extracted from two or more spatially resolved spectra of a given extended source, was developed. It performs a simultaneous, N-component, nonlinear least-squares fit to the cross-dispersion profiles in the LBL image, utilizing this description of the cross-dispersion PSF to constrain the fitting parameters. Weighting functions are determined in each wavelength bin, based on these fits, for each of the N point sources assumed to be present in the aperture. These weights are used in the spectral decomposition routine to assign a fraction of the flux at each line of the LBL image to each component, but they can also be used for astrometric purposes, i.e., to determine the spatial separations between the components. The validity of the technique and the value of the full two-dimensional spatial solution in such crowded regions as the central cores of globular clusters, where partial occultation by the edges of the large aperture may otherwise distort interpretation of the stellar spectra, are demonstrated.
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