Astron. Astrophys. Suppl. Ser.
Volume 141, Number 2, January II 2000
|Page(s)||343 - 355|
|Published online||15 January 2000|
The INES system
III. Evaluation of IUE NEWSIPS high resolution spectra
Laboratorio de Astrofísica Espacial y Física Fundamental, VILSPA, P.O. Box 50727, E-28080 Madrid, Spain
2 CNR, Istituto di Astrofisica Spaziale, Via del Fosso del Cavaliere, I-00133 Roma, Italy
3 Dipartimento di Fisica E. Amaldi, Universitá Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy
4 ESA-IUE Observatory, VILSPA, P.O. Box 50727, E-28080 Madrid, Spain
Send offprint request to: R. González-Riestra
Accepted: 22 October 1999
This paper discusses the overall quality of high resolution data processed with the software in terms of flux and wavelength accuracy. It also describes the processing of high resolution spectra within the framework of the ESA “IUE Newly Extracted Spectra” () System. This system provides the high resolution data in two formats: the high resolution “concatenated” spectra, in which the spectral orders are connected, eliminating the overlap regions through a procedure designed to optimize the signal-to-noise ratio at the edges of the orders, and the “rebinned” spectra, i.e. the high resolution concatenated spectra resampled into the low resolution wavelength domain. Our study reveals the existence of a significant discrepancy in the wavelength scales of short and long wavelength high resolution spectra. The processing applies a correction of +17.7 km s-1 to the wavelength scale of the high resolution SWP spectra in order to provide an internally consistent velocity scale. Similarly, suitable corrections have been applied to long wavelength small aperture spectra. The new wavelength scale is, within the errors, in good agreement with the optical velocity scale.
Key words: methods: data analysis; techniques: image processing; ultraviolet: general
© European Southern Observatory (ESO), 2000