Evolved stars with complex atmospheres - the high spectral resolution, mid-IR view

Autor: Ryde, N., Lambert, J., Richter, M. J., Josselin, E., Harper, G. M., Eriksson, K., Boogert, A., DeWitt, C., Encrenaz, T., Greathouse, T., Jaffe, D., Kulas, K., McKelvey, M., Najita, J., Vacca, W.
Rok vydání: 2014
Předmět:
Druh dokumentu: Working Paper
Popis: The physical structures of the outer atmospheres of red giants are not known. They are certainly complex and a range of recent observations are showing that we need to embrace to non-classical atmosphere models to interpret these regions. This region's properties is of importance, not the least, for the understanding of the mass-loss mechanism for these stars, which is not still understood. Here, we present observational constraints of the outer regions of red giants, based on mid-IR, high spectral resolution spectra. We also discuss possible non-LTE effects and highlight a new non-LTE code that will be used to analyse the spectra of these atmospheric layers. We conclude by mentioning our new SOFIA/EXES observations of red giants at 6 microns, where the vibration-rotation lines of water vapour can be detected and spectrally resolved for the first time.
Comment: Talk presented at the "Why Galaxies Care About AGB Stars III" conference in Vienna, July 2014. It will be published in the Astronomical Society of the Pacific Conference Series
Databáze: arXiv