I have made major contributions to the interpretation of
high-resolution, mid-infrared spectra of stars, especially those of red
supergiants. For instance, I discovered unexpected water vapour in the
atmospheres of warm giant stars. These observations are very useful to
test models of the outer atmospheric structures. We still do not know
whether inhomogeneities are important or whether there are further
circumstellar regions with matter not accounted for. The
interpretations of the water vapour lines have caused a lively debate
in the literature. Our powerful observations of a whole range of stars
will be decisive in this context.
- The Mg I lines emission at 12 microns
Furthermore, I detected and modelled successfully the first
observations of stellar (non-solar) Mg I emission lines at 12 microns.
These Zeeman sensitive lines are potentially useful for measuring
stellar magnetic fields (In November 2006 we will explore this
possibility at the Gemini North telescope).
The outer atmospheric and circumstellar environments of red giant stars
are very complicated structures and studying them by high-resolution,
infrared spectroscopy is providing us with new insights and
I have been leading several successful scientific projects from the
start to the final publications. As a result of my research, I have
detected and studied carbon-dioxide
line emisson, and I have developed
the method of 'stellar wind archaeology' and investigated winds in
scattered on wind molecules.
In 2000, work along these lines resulted in my thesis `Infrared Spectroscopic Investigations of Stellar Winds from Red Giants' (Acta Universitatis Upsaliensis. Comprehensive Summaries of
Uppsala Dissertations from the Faculty of Science and Technology; 515.
51 pp. Uppsala. ISBN 91-554-4669-8). Available are also the press release in Swedish, the spikblad,
and the abstract of the thesis.