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Issue A&A
Volume 400, Number 2, March III 2003
Page(s) 679 - 694
Section Formation and evolution of planetary systems
DOI 10.1051/0004-6361:20021793



A&A 400, 679-694 (2003)
DOI: 10.1051/0004-6361:20021793

ISO-SWS calibration and the accurate modelling of cool-star atmospheres

II. General results
L. Decin1, B. Vandenbussche1, C. Waelkens1, K. Eriksson2, B. Gustafsson2, B. Plez3, A. J. Sauval4 and K. Hinkle5

1  Instituut voor Sterrenkunde, KULeuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
2  Institute for Astronomy and Space Physics, Box 515, 75120 Uppsala, Sweden
3  GRAAL - CC72, Université de Montpellier II, 34095 Montpellier Cedex 5, France
4  Observatoire Royal de Belgique, Avenue Circulaire 3, 1180 Bruxelles, Belgium
5  National Optical Astronomy Observatory (Operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation. ) , PO Box 26732, Tucson, Arizona 85726, USA

(Received 22 November 2001 / Accepted 2 December 2002)

Abstract
The fine calibration of the ISO-SWS detectors (Infrared Space Observatory - Short Wavelength Spectrometer) has proven to be a delicate problem. We therefore present a detailed spectroscopic study in the 2.38-12  $\mu$m wavelength range of a sample of 16 A0-M2 stars used for the calibration of ISO-SWS. By investigating the discrepancies between the ISO-SWS data of these sources, the theoretical predictions of their spectra, the high-resolution FTS-KP (Kitt Peak) spectrum of $\alpha$ Boo and the solar FTS-ATMOS (Atmospheric Trace Molecule Spectroscopy) spectrum, both calibration problems and problems in computing the theoretical models and the synthetic spectra are revealed. The underlying reasons for these problems are sought for and the impact on the further calibration of ISO-SWS and on the theoretical modelling is discussed extensively.


Key words: instrumentation: spectrographs -- methods: data analysis -- infrared: stars -- stars: atmospheres -- stars: late-type -- stars: fundamental parameters

Offprint request: L. Decin, Leen.Decin@ster.kuleuven.ac.be

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