Evolved Stars with Complex Atmospheres - the High Spectral Resolution, mid-IR View
2015 (English)In: Why galaxies care about AGB stars III: a closer look in space and time, ASTRONOMICAL SOC PACIFIC , 2015, Vol. 497, 67-71 p.Conference paper (Refereed)Text
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 non-classical model atmospheres to interpret these regions. This region's properties are of importance, not the least for an understanding of the mass-loss mechanism for these stars. Here we present observational constraints on 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 67 mu m, where the vibration-rotation lines of water vapour can be detected and spectrally resolved for the first time.
Place, publisher, year, edition, pages
ASTRONOMICAL SOC PACIFIC , 2015. Vol. 497, 67-71 p.
, Astronomical Society of the Pacific conference series, ISSN 1050-3390 ; 497
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-301746ISI: 000371098100008ISBN: 978-1-58381-879-4ISBN: 978-1-58381-878-7OAI: oai:DiVA.org:uu-301746DiVA: diva2:955188
Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, JUL 28-AUG 01, 2014, Univ Vienna, Vienna, AUSTRIA