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ID: 5818.0, MPI für extraterrestrische Physik / Infrared and Submillimeter Astronomy
The ISO-SWS post-helium atlas of near-infrared stellar spectra
Authors:Vandenbussche, B.; Beintema, D.; de Graauw, T.; Decin, L.; Feuchtgruber, H.; Heras, A.; Kester, D.; Lahuis, F.; Lenorzer, A.; Lorente, R.; Salama, A.; Waelkens, C.; Waters, L.; Wieprecht, E.
Date of Publication (YYYY-MM-DD):2002-08
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:3
Start Page:1033
End Page:1048
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We present an atlas of near-infrared spectra (2.36 mum-4.1 mum) of similar to300 stars at moderate resolution (lambda/delta lambda = 1500-2000). The spectra were recorded using the Short- Wavelength Spectrometer aboard the Infrared Space Observatory (ISO-SWS). The bulk of the observations were performed during a dedicated observation campaign after the liquid helium depletion of the ISO satellite, the so-called post-helium programme. This programme was aimed at extending the MK- classification to the near-infrared. Therefore the programme covers a large range of spectral types and luminosity classes. The 2.36 mum-4.05 mum region is a valuable spectral probe for both hot and cool stars. H I lines (Bracket, Pfund and Humphreys series), He I and He II lines, atomic lines and molecular lines (CO, H2O, NH, OH, SiO, HCN, C2H2,...) are sensitive to temperature, gravity and/or the nature of the outer layers of the stellar atmosphere (outflows, hot circumstellar discs, etc.). Another objective of the programme was to construct a homogeneous dataset of near-infrared stellar spectra that can be used for population synthesis studies of galaxies. At near-infrared wavelengths these objects emit the integrated light of all stars in the system. In this paper we present the dataset of post-helium spectra completed with observations obtained during the nominal operations of the ISO- SWS. We discuss the calibration of the SWS data obtained after the liquid helium boil-off and the data reduction. We also give a first qualitative overview of how the spectral features in this wavelength range change with spectral type. The dataset is scrutinised in two papers on the quantitative classification of near-infrared spectra of early-type stars (Lenorzer et al. 2002) and late-type stars (Vandenbussche et al., in prep).
Free Keywords:stars : general; infrared : stars; atlases
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan; 200B, B-3001 Louvain, Belgium; Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Louvain, Belgium; Sterrenkundig Inst Anton Pannekoek, Amsterdam, Netherlands; SRON, Natl Inst Space Res, Groningen, Netherlands; Max Planck Inst Extraterr Phys, D-8046 Garching, Germany; ESA, ESTEC, Res & Sci Support Dept, Astrophys Missions Div, NL-2200 AG Noordwijk, Netherlands; ESA, Div Astrophys, ISO Data Ctr, Villafranca Del Castillo, Spain
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