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Astron. Astrophys. Suppl. Ser. 141, 343-355
The INES system
III. Evaluation of IUE NEWSIPS high resolution spectra
R. González-Riestra1
- A. Cassatella2,3
- E. Solano1
- A. Altamore3 - W. Wamsteker4![[*]](/icons/foot_motif.gif)
Send offprint request: R. González-Riestra,
e-mail: ch@laeff.esa.es
1 - 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
Received July 23; accepted October 22, 1999
Abstract:
This paper discusses the overall quality of
IUE high
resolution data processed with the
NEWSIPSsoftware in terms
of flux and wavelength accuracy. It also describes the
processing of
NEWSIPS high resolution spectra within the
framework of the ESA "IUE Newly Extracted Spectra'' (
INES)
System. This system provides the
IUE 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
NEWSIPS high
resolution spectra. The
INES 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
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