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

We analyse ISO–SWS 01 ($R \sim 1500$) $12{-}27.5\,\mu$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.

[1]  Martin F. Kessler,et al.  The calibration legacy of the ISO Mission , 2003 .

[2]  U. Jørgensen,et al.  H2O in stellar atmospheres II. ISO spectra of cool red giants and hydrostatic models , 2002 .

[3]  T. Ayres.  Does the Sun Have a Full-Time COmosphere? , 2002 .

[4]  C. Waelkens,et al.  ISO-SWS calibration and the accurate modelling of cool-star atmospheres ? IV. G9 to M2 stars ?? , 2002, astro-ph/0207653.

[5]  Detection of Water Vapor in the Photosphere of Arcturus , 2002, astro-ph/0207368.

[6]  K. Eriksson,et al.  The 3 micron spectrum of R Doradus observed with the ISO-SWS , 2002, astro-ph/0202171.

[7]  T. Onaka,et al.  The time variation in infrared water-vapour bands in Mira variables , 2002, astro-ph/0201084.

[8]  J. Tennyson,et al.  Spectral analysis of water vapour in cool stars , 2001, astro-ph/0110649.

[9]  T. Tsuji.  Water in K and M giant stars unveiled by ISO , 2001, astro-ph/0109004.

[10]  P. Jensen,et al.  H2O in stellar atmospheres , 2001 .

[11]  J. Tennyson,et al.  Accurate partition function and thermodynamic data for water , 2000 .

[12]  Harry Partridge,et al.  Convergence testing of the analytic representation of an ab initio dipole moment function for water: Improved fitting yields improved intensities , 2000 .

[13]  Belgium,et al.  ISO-SWS calibration and the accurate modelling of cool-star atmospheres - I. Method , 2000, astro-ph/0008316.

[14]  T. Tsuji.  Water on the Early M Supergiant Stars α Orionis and μ Cephei , 2000 .

[15]  H. C. Stempels,et al.  VALD{2: Progress of the Vienna Atomic Line Data Base ? , 1999 .

[16]  R. L. Roy,et al.  Improved Parameterization for Combined Isotopomer Analysis of Diatomic Spectra and Its Application to HF and DF. , 1999 .

[17]  H. C. Stempels,et al.  The Vienna Atomic Line Data Base – a Status Report , 1999 .

[18]  A. Goldman,et al.  NITRIC OXIDE LINE PARAMETERS: REVIEW OF 1996 HITRAN UPDATE AND NEW RESULTS , 1998 .

[19]  Laurence S. Rothman,et al.  Reprint of: The HITRAN molecular spectroscopic database and HAWKS (HITRAN Atmospheric Workstation): 1996 edition , 1998 .

[20]  A. Goldman,et al.  Updated line parameters for OH X2II–X2II (ν′',ν′) Transitions , 1998 .

[21]  D. Schwenke.  Opacity of TiO from a coupled electronic state calculation parametrized by abinitio and experimental data , 1998 .

[22]  Harry Partridge,et al.  The determination of an accurate isotope dependent potential energy surface for water from extensive ab initio calculations and experimental data , 1997 .

[23]  L. Metcalfe,et al.  Spectral Irradiance Calibration in the Infrared. VI. 3-35 micron Spectra of Three Southern Standard Stars , 1996 .

[24]  P. Bernath,et al.  Water on the sun. , 1995, Science.

[25]  Blaine A. Bell,et al.  Atomic Line Data , 1995 .

[26]  R. Kurucz.  The Kurucz Smithsonian Atomic and Molecular Database , 1995 .

[27]  D. Goorvitch.  Infrared CO line for the X 1 Sigma(+) state , 1994 .

[28]  S. Saar,et al.  Carbon Monoxide Fundamental Bands in Late-Type Stars. III. Chromosphere or CO-mosphere? , 1994 .

[29]  V. Smith,et al.  Lithium abundances and other clues to envelope burning in small Magellanic Cloud asymptotic giant branch stars , 1993 .

[30]  S. Langhoff,et al.  A theoretical study of the electric dipole moment function of SiO , 1993 .

[31]  Michael J. Barlow,et al.  Spectral irradiance calibration in the infrared. I - Ground-based and IRAS broadband calibrations , 1992 .

[32]  Elangannan Arunan,et al.  Vibration–rotational Einstein coefficients for HF/DF and HCl/DCl , 1992 .

[33]  M. Geller.  A high-resolution atlas of the infrared spectrum of the Sun and the Earth atmosphere from space. Volume 3: Key to identification of solar features , 1992 .

[34]  N. Grevesse,et al.  Abundances of the elements: Meteoritic and solar , 1989 .

[35]  C. B. Farmer,et al.  A high-resolution atlas of the infrared spectrum of the Sun and Earth atmosphere from space : a compilation of ATMOS spectra of the region from 650 to 4800 cm[-1] (2.3 to 16 [symbol for Greek letter mu]m) , 1989 .

[36]  S. Langhoff,et al.  Theoretical study of the dipole moment function of OH(X 2Π) , 1987 .

[37]  F. J. Low,et al.  DISCOVERY OF A SHELL AROUND ALPHA-LYRAE , 1984 .

[38]  R. Tipping,et al.  Dipole moment functions of the hydrogen halides , 1980 .

[39]  H. R. Johnson,et al.  A statistical method for treating molecular line opacities. [in cool stellar atmospheres] , 1976 .

[40]  B. Edĺen.  The Refractive Index of Air , 1966 .

[41]  Peter Bodenheimer,et al.  Studies in Stellar Evolution. III. The Calculation of Model Envelopes. , 1965 .