A&A 414, 677-697 (2004)
DOI: 10.1051/0004-6361:20031579

On the analysis of band 3 of the ISO-SWS calibration sources

R. Van Malderen¹, L. Decin¹, D. Kester², B. Vandenbussche¹, C. Waelkens¹, J. Cami³ and R. F. Shipman<sup>2

1</sup>  Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
²  Space Research Organization Netherlands, PO Box 800, 9700 AV Groningen, The Netherlands
³  NASA Ames Research Center, Mail Stop 245-6, Moffett Field, CA 94035-1000, USA

(Received 2 January 2003 / Accepted 2 October 2003 )

Abstract
We analyse ISO-SWS 01 ( ) m (band 3) spectra of the 10 standard calibration stars with the highest flux using synthetic spectra generated from (MARCS) atmosphere models. The comparison between the observed and synthetic spectra reveals the quality of (1) the atmospheric model construction and subsequent synthetic spectra computation and of (2) the (OLP 10.1) calibration and data reduction of the spectrometer at these wavelengths.

The models represent the general features of the observations, but the synthetic spectrum computation is hampered by the lack of comprehensive molecular and atomic line lists. We also suspect some problems with the temperature distribution in the outer layers of the model and inaccuracies in the extrapolation of the collision-induced absorption coefficients of H ₂ pairs. We detect baseline ripples and fringes in the observed spectra, that survive the calibration and detailed reduction process. Photometric calibration uncertainties are estimated by means of the scaling factors between the synthetic and observed spectra.

Key words: stars: atmospheres -- stars: fundamental parameters -- instrumentation: spectrographs -- molecular data

Offprint request: R. Van Malderen, Roeland.VanMalderen@ster.kuleuven.ac.be

SIMBAD Objects

© ESO 2004

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

• If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
• You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
• You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.