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Systematic trend of water vapour absorption in red giant atmospheres revealed by high resolution TEXES 12 <i>μ</i>m spectra
The structures of the outer atmospheres of red giants are very complex. The notion of large optically thick molecular spheres around the stars (MOLspheres) has been invoked in order to explain e.g. spectro-interferometric observations. However, high-resolution spectra in the mid-IR do not easily fit into this picture. They rule out …