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 – Astronomy

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Carbon Monoxide, Cool Stars, Image Analysis, Infrared Spectroscopy, Spectrophotometry, Stellar Atmospheres, Chromosphere, Fourier Transformation, Infrared Astronomy, K Stars, Spectral Emission

Scientific paper

The upper layers of the atmospheres of late-ype stars is investigated. The study is based on the observation and analysis of carbon monoxide (CO) fundamental (delta v = 1) spectra at 4.7 microns. CO fundamental spectra provide an alternative way for the study of cool stellar atmospheres. A postdispersion system for astronomical Fourier spectrometers is developed. This is achieved in the constructed instrument by using a liquid helium-cooled grating monochromator as a narrowband filter. The theoretical basis for the quantitative evaluation of observed CO spectra in a number of cool stars is provided. Boundary temperatures and thermal profiles of stellar atmospheres were determined from the observation of a number of stars and semi-empirical models derived. The comparison of the observed temperatures with theoretical predictions based on radiative equilibrium (RE) models yields good agreement for several cool stars including Arcturus and Aldebaran. The CO models are incompatible with homogeneous chromospheres (hot, non-classical regions), as derived for some of the stars from conventional diagnostics by other groups. A second group of stars (epsilon Vir, beta Draco, beta Corvi, beta Gem) shows boundary temperatures considerably higher than predicted from RE-models. A strong discrepancy between CO-based and chromospheric model is still obvious in beta Gem, but cannot be claimed for beta Draco.

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