Development of a postdispersion system for astronomical infrared observations with Fourier spectrometers and its application in the study of the CO fundamental bands in F, G and K stars.

Astronomy and Astrophysics – Astrophysics

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The goal of this thesis is an investigation of the upper layers of the atmospheres of late-type stars. The study is based on the observation and analysis of carbon monoxide fundamental (Δν = 1) spectra at 4.7 μm. CO fundamental spectra provide a new and alternative way for the study of cool stellar atmospheres. In order to provide the high spectral resolution and high sensitivity required for the observation of stellar CO infrared (IR) spectra, a postdispersion system for astronomical Fourier spectrometers has been developed. Postdispersion improves the sensitivity of background-limited IR observations by restricting the spectral range incident on the detector. This is achieved in the constructed instrument by using a liquid helium-cooled grating monochromator as a narrowband filter.

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