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Lithium abundances along the RGB: FLAMES-GIRAFFE spectra of a large sample of low-mass Bulge stars
Thomas Lebzelter, Stefan Uttenthaler, Maurizio Busso +2
Context: A small number of K-type giants on the red giant branch (RGB) is known to be very rich in lithium (Li). This fact is not accounted for by standard stellar evolution theory…
Elemental abundances in AGB stars and the formation of the Galactic bulge
Stefan Uttenthaler, Joris A. D. L. Blommaert, Thomas Lebzelter +4
We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge. The aim of the project is to determine key elemental abundances in these stars to help co…
Determination of stellar parameters of C-rich hydrostatic stars from spectro-interferometric observations
C. Paladini, G. T. van Belle, B. Aringer +4
Giant stars, and especially C-rich giants, contribute significantly to the chemical enrichment of galaxies. The determination of precise parameters for these stars is a necessary p…
Synthetic photometry for carbon-rich giants II. The effects of pulsation and circumstellar dust
Walter Nowotny, Bernhard Aringer, Susanne Höfner +1
By using self-consistent dynamic model atmospheres which simulate pulsation-enhanced dust-driven winds of AGB stars we studied in detail the influence of (i) pulsations of the stel…
Dust in AGB stars: transparent or opaque?
Sara Bladh, Susanne Höfner, Bernhard Aringer
It is commonly believed that winds of cool giants in their late evolutionary stages are driven by radiative pressure on dust grains, but the actual grain species responsible for dr…