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Phase Closure Image Reconstruction for Future VLTI Instrumentation
Mercedes E. Filho, Stephanie Renard, Paulo Garcia +21
Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order…
Phase Referencing in Optical Interferometry
Mercedes E. Filho, Paulo Garcia, Gilles Duvert +20
One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic rang…
The fluorine abundance in a Galactic Bulge AGB star measured from CRIRES spectra
Stefan Uttenthaler, Thomas Lebzelter, Bernhard Aringer +3
We present measurements of the fluorine abundance in a Galactic Bulge Asymptotic Giant Branch (AGB) star. The measurements were performed using high resolution K-band spectra obtai…
The AGB stars of the intermediate-age LMC cluster NGC 1846 Variability and age determination
T. Lebzelter, P. R. Wood
Aims: To investigate variability and to model the pulsational behaviour of AGB variables in the intermediate-age LMC cluster NGC 1846. Methods: Our own photometric monitoring has b…
Low-mass lithium-rich AGB stars in the Galactic bulge: evidence for Cool Bottom Processing?
Stefan Uttenthaler, Thomas Lebzelter, Sara Palmerini +3
Context: The stellar production of the light element lithium is still a matter of debate. Aims: We report the detection of low-mass, Li-rich Asymptotic Giant Branch (AGB) stars loc…
Tracing the development of dust around evolved stars: The case of 47 Tuc
T. Lebzelter, T. Posch, K. Hinkle +2
We observed mid-infrared (7.5-22 mum) spectra of AGB stars in the globular cluster 47 Tuc with the Spitzer telescope and find significant dust features of various types. Comparison…