Abstract
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 constrain the formation history of the bulge. A further aim is to link the photospheric abundances to the dust species found in the winds of the stars. Here we present a progress report of the analysis of the spectra.
Highlights
The bulge of the Milky Way Galaxy is one of its major components, but its formation is still poorly understood
We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge
A further aim is to link the photospheric abundances to the dust species found in the winds of the stars
Summary
The bulge of the Milky Way Galaxy is one of its major components, but its formation is still poorly understood. It still holds many surprises for us, see e.g. the recently discovered double red clump [1, 2]. Elemental abundances in bulge stars are an important tool to constrain formation scenarios. K/M giants and PNe in the bulge have already been studied for their abundance patterns, but not the evolutionary state between them, the AGB. We obtained high-resolution near-IR spectra of 45 AGB stars with the CRIRES@VLT spectrograph to better characterise the giant star population in the bulge
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