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MO: Fachverband Molekülphysik
MO 21: Astrophysics and Ions
MO 21.1: Hauptvortrag
Freitag, 13. März 2020, 14:00–14:30, f142
Laboratory experiments as tool to understand the infrared sky at high spectral resolution — •Guido W. Fuchs — Laborastrophysik, Physik Institut, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel
In the universe, chemistry starts when atoms are expelled from the hot inner regions of evolved stars and form molecules in the cooler outer atmospheres and stellar envelopes. Thus, at the end of their lifetime low and intermediate mass asymptotic giant branch (AGB) stars and the more massive red super giants, are building up strong stellar winds which are major sources of small to intermediate sized molecules and dust in the universe. Especially molecules composed of refractory materials like metal atoms, carbon or silicon are crucial for dust formation. To understand these formation processes these precursor molecules need to be observed and identified which can be done at infrared wavelengths using high resolution spectrographs. But in addition, high resolution gas-phase spectra of possible precursor molecules are needed to compare with those from astronomical observations. In our laboratories we study the gas-phase spectra of these kinds of molecules via high resolution infrared spectroscopy. Our experimental setups will be presented and examples of investigated molecules, like TiO, Al2O and C3, will be given. In addition, recent observations using the TEXES spectrograph on the infrared telescope IRTF observations will be shown. Examples are the late-type stars, Canis Majoris, o-ceti (Mira) and others. The observational and experimental results will be related and discussed.