Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.........5v&link_type=abstract
PhD Thesis, Leuven: K.U.Leuven, 2002, 222 pages
Other
1
Iso, Infrared, Calibration, Sws, Stellar Classification, Unsupervised Classification
Scientific paper
The Short Wavelength Spectrometer (SWS) was one of the four instruments onboard the European infrared space telescope ISO. We describe the calibration of the SWS instrument during the nominal lifetime of the ISO satellite. We indicate how the properties of the different instrument components add their own signature to the ISO-SWS data that we receive on Earth. In the framework of this thesis we primarily contributed to two aspects of the SWS calibration: the relative spectral response calibration and the spatial response calibration on a sub-arcsecond scale. We discuss the ISO-SWS search for solid oxygen in cold, dense clouds in the interstellar medium (ISM). We determined an upper limit for the solid oxygen abundance in these regions. This result and other recent observations of oxygen-bearing species allowed us to compare the total amount of oxygen detected in the dense ISM to the oxygen abundance in the diffuse ISM. Part of the oxygen in the cold, dense regions appears to be missing and we conclude that this deficit indicates that atomic gas is the dominant oxygen-bearing species in these regions. After the depletion of the liquid Helium that cooled the telescopes and instruments, we used the SWS to record near-infrared spectra of a set of stars covering a wide range of spectral types and luminosities. We discuss the calibration of the instrument in this phase. The resulting atlas covers spectra of 296 stars and gives a qualitative overview of how the spectral features in this wavelength range change with spectral type. We show how we used an automatic Bayesian classification algorithm to discover classes in these spectra.
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